Category: Industrial Engineering Expert Witness

  • Psychiatry Expert’s Testimony Rejected for Injecting Subjective Characterizations

    Psychiatry Expert’s Testimony Rejected for Injecting Subjective Characterizations

    On September 3, 2020, Plaintiffs Dalila Yeend and Bounnam Phimasone (together with Elvin Minaya Rodriguez, Lisa LaPointe, and Shantadewie Rhamee, “Plaintiffs”) commenced this action against Akima Global Services, LLC a/k/a AGS (“AGS” or “Defendant”) in New York State Supreme Court, asserting state law claims pertaining to their civil immigration detention at the Buffalo Federal Detention Facility (“BFDF”).

    On October 16, 2020, Defendant removed this action to federal court. Almost two years later, Plaintiffs Yeend and Phimasone filed an amended complaint with class action allegations and claims for unjust enrichment and violations of the Trafficking Victims Protection Reauthorization Act (“TVPRA”) and the New York Labor Law (“NYLL”).

    Defendant sought to preclude the testimony of Dr. Stuart Grassian and Dr. Michael Childers

    Psychiatry Expert Witness

    Dr. Stuart Grassian is a board-certified psychiatrist and former faculty member of Harvard Medical School with experience in “evaluating individuals who were in conditions of confinement in prisons, ICE detention facilities, and secure psychiatric hospitals[.]”

     He has authored articles on topics such as the psychiatric effects of solitary confinement and the effects of restricted and isolated conditions of confinement, and has previously provided expert testimony in cases regarding conditions of confinement.

    Get the full story on challenges to Stuart Grassian’s expert opinions and testimony with an in-depth Challenge Study.

    Industrial Engineering Expert Witness

    Dr. Michael Childers is a Professor in the Department of Labor Education at the University of Wisconsin-Madison, holds an M.S. and Ph.D. in workforce education and development and a B.S. in industrial engineering, and has worked on numerous “time studies” to assess “the time that should be allowed to perform work activities.”

    Want to know more about the challenges Michael Childers’ has faced? Get the full details with our Challenge Study report. 

    Discussion by the Court

    Dr. Stuart Grassian

    Grassian opines “to a reasonable degree of medical certainty, that for a reasonable person in the position that the Batavia detainees find themselves, and with the attitude, threats, and punishments inflicted on those who refused to work, the work program at ICE-Batavia is coercive in nature.” In addition, Grassian concluded that (i) “[t]he conditions of the detention center collectively amount to a deprivation scheme;” (ii) “AGS exploits detainees’ access to resources and safety in order to coerce workers into working for wages that few people would voluntarily accept;” and (iii) “to a reasonable degree of medical certainty the Voluntary Work Program (“VWP”) at Batavia was psychologically damaging and scarring for the detainees exposed to it.”

    Relevance

    Grassian’s report includes a lengthy recitation of selected record evidence, as well as references to the amended complaint. Indeed, of his less than fourteen-page report, approximately seven pages appear to be direct quotes from interview notes taken by Grassian’s assistant, witness declarations, depositions, and the amended complaint. Additionally, in multiple areas of his report, Grassian appears to inject his subjective characterizations of detainee testimony to bolster his conclusions regarding the VWP.

    The Court found that Grassian’s report largely recites testimony and characterizes it in a manner that is favorable to Plaintiffs and, thus, impermissibly “construct[s] a factual narrative based upon record evidence.”

    In addition, and most notably, the Court found that Grassian’s expected testimony would impermissibly “tell the jury what results to reach.”

    By opining that (i) “AGS exploits detainees’ access to resources and safety in order to coerce workers into working;” and that (ii) “the [VWP] at Batavia was psychologically damaging and scarring for the detainees exposed to it,” Grassian is essentially telling the jury that Defendant knowingly coerced participation in the VWP and that the detainees exposed to the VWP at the BFDF did, in fact, feel psychologically coerced.

    Dr. Michael Childers

    Childers was retained to (i) determine the work time necessary for the performance of certain VWP tasks; and (ii) calculate the amount BFDF detainees would have been compensated for performing those tasks had they been paid the minimum wage.

    Childers also used those work times to calculate what AGS would have had to pay its own non-detainee employees, making market wages, to do the same work performed by detainees in the VWP.

    i. Qualifications

    Defendant argued that Childers’ background in industrial engineering, education, and labor relations is not relevant to assessing required staffing levels and associated costs at a secure federal detention facility, and that Childers lacked the requisite specialized knowledge related to federal contracts, regulations, or detention facilities necessary to render opinions on those topics.

    Here, Defendant did not dispute that Childers held advanced degrees in workforce education and development. Childers’ curriculum vitae indicated that he is currently teaching courses on topics such as “contract costing, budget and financial analysis, . . . and stopwatch time study.” Defendant also did not dispute Childers’ attestation that he has “conducted hundreds of time studies in manufacturing, warehousing, service, and government organizations.”

    Additionally, Childers has previously provided expert deposition testimony in a number of cases, many involving labor law claims.

    Childers utilized resources that are common in the field in which he holds degrees and instructs, as well as schematics and internal documents from the BFDF, to calculate the average number of hours an individual would need to complete certain labor while in the VWP. He then used those work hour determinations to calculate the wages detainees would have earned if paid the minimum wage, and the wages AGS would have had to pay its own non-detainee employees for such labor if they were paid the market wage.

    Accordingly, the Court found that Childers is qualified to render the opinions set forth in his report.

    ii. Sufficient Facts or Data and Reliable Methodology

    In his report, Childers describes the materials on which he relies and the assumptions he makes in reaching his conclusions. Specifically, Childers relied on the Association of Physical Plant Administrators’ (“APPA”) methodologies, applicable Federal Service Contract Act (“SCA”) wage data, discovery documents, and deposition testimony in this matter to determine the rate at which AGS would substitute market labor for detainee labor “but for the work program.”

    Childers calculated: (1) the amount detainees would have made if they were making the minimum wage, and the savings AGS arguably retained from paying detainees only one dollar per day; and (2) the cost that would have been required to replace detainee labor with full-time, non-detainee AGS employees, and the savings AGS purportedly retained from not doing so and instead paying detainees one dollar per day.

    The Court found that this methodology is sufficiently reliable.

    Defendant nonetheless asserted that the data that Childers extrapolated from the APPA Guidelines is too generic, overly inclusive, and failed to consider certain data adjustments that Defendant contended should have been made. However, similar to disagreements as to an expert’s qualifications, disputes as to faults in an expert’s use of a particular methodology “are grist for cross-examination, and go towards weight, not admissibility.”

    Moreover, Childers was instructed to assume that “AGS operates the Batavia immigrant detention facility and must do so by standards issued by the Department of Homeland Security (DHS) and U.S. Immigration and Customs Enforcement (ICE).” As such, Childers’ assumption that AGS would be responsible for the damages calculated does not render his conclusions or methodologies unreliable.

    iii. Relevance

    Moreover, Childers’ damages analyses utilize various specialized resources to calculate work times and wage rates that the Court finds are not easily interpreted by a lay person. In addition, Childers performs technical calculations not readily undertaken by a lay person, including calculation of the cost that Defendant would have incurred to pay outside contractors to perform the work covered by the VWP during the relevant time periods. The Court determined that this precisely the type of assistance that Rule 702 and Daubert allow.

    Held

    The Court granted in part and denied in part the Defendant’s motion in limine to exclude the testimony of Stuart Grassian and Michael Childers.

    Key Takeaways:

    • Defendant failed to explain why Childers’ undisputed experience in other work settings, including with “government organizations,” would be inapplicable in the detention setting, nor is it apparent to the Court. Indeed, the Court found that Childers’ experience, particularly with respect to conducting time studies, is sufficiently applicable here. Moreover, disputes as to the strength of an expert’s credentials generally go to the weight, not the admissibility, of the expert’s testimony.
    • Expert testimony must be carefully circumscribed to assure that the expert does not usurp either the role of the trial judge in instructing the jury as to the applicable law or the role of the jury in applying that law to the facts before it. The Court fiound that Grassian’s report largely recites testimony and characterizes it in a manner that is favorable to Plaintiffs and, thus, impermissibly “constructs a factual narrative based upon record evidence.”

    Case Details:

    Case Caption: Yeend Et Al V. Akima Global Services, LLC
    Docket Number: 1:20cv1281
    Court Name: United States District Court, New York Northern
    Order Date: March 31, 2025
  • Industrial Engineering Expert Witness Permitted to Testify that the Subject Iron Worker Was Defectively Designed

    Industrial Engineering Expert Witness Permitted to Testify that the Subject Iron Worker Was Defectively Designed

    Plaintiff Richard Culley (“Plaintiff” or “Culley”) initiated this action on September 9, 2020, seeking redress for claims of manufacturing defect, breach of expressed or implied warranties, design defect and failure to warn arising from an incident on December 9, 2017 (the “accident”) wherein Plaintiff, while working for Hudson River Truck and Trailer (“Hudson”), sustained serious injuries while using a JAWS IV Ironworker (the “Ironworker”) manufactured by the Defendant Edwards Manufacturing Company of Alberta Lea (“Defendant” or “Edwards”). 

    Plaintiff designated Kevin Elphick, an industrial engineering expert witness, to evaluate the details and subsequent events that led to the injuries. The Defendant filed a motion in limine to preclude Elphick’s testimony.

    Industrial Engineering Expert WitnessIndustrial Engineering Expert Witness

    Industrial Engineering Expert Witness

    Kevin J. Elphick is an independent industrial engineer with a B.S. Degree in Industrial Engineering from the New Jersey Institute of Technology (class of 1972), a New Jersey licensed Professional Engineer (1981) and has over 45 years of professional experience.

    Want to know more about the challenges Kevin J. Elphick has faced? Get the full details with our Challenge Study report.  

    Discussion by the Court

    Kevin Elphick’s Testimony

    To establish a design defect, Culley must prove that the ironworker was
    defective at the time it left Edwards’s control and that the defective design was the actual and proximate cause of his injuries. Defendants argued that Elphick has not provided data to support his opinion that the subject iron
    worker was defectively designed or that any proposed alternative design would have prevented Culley’s accident. Rather, Elphick’s opinions constitutes the type of ipse dixit that courts routinely hold should be precluded from evidence.

    Analysis

    Under Federal Rule of Evidence 702, expert testimony must meet standards of reliability and relevance. Courts assess whether the expert is qualified and whether their testimony is based on sufficient facts, reliable methods, and proper application of those methods. Courts must focus on the purported expert’s principles and methodology, not on the expert’s conclusions. 

    The Court held that the Defendant’s arguments primarily questioned Elphick’s credibility, which was a matter for the jury and not grounds for excluding expert testimony.

    In Bravo v. Shamailov, 221 F. Supp. 3d 413, 423 (S.D.N.Y. 2016), it was determined that the jury is responsible for determining a witness’ credibility and the weight of their testimony.

    Since the Defendant’s motion did not address the relevant factors for excluding expert testimony under Rule 702, the Court denied the motion to preclude Elphick’s testimony.

    Held

    The Court denied the Defendant’s motion to preclude Plaintiff’s industrial engineering expert witness Kevin Elphick’s testimony.

    Key Takeaway:

    The Court emphasized that challenges to Elphick’s credibility should be evaluated by the jury, not used as grounds for exclusion. The motion to preclude Elphick’s testimony failed to substantively address the standards under the Federal Rule of Evidence 702, which instructs district courts to ensure that: “(1) the testimony is based upon sufficient facts or data, (2) the testimony is the product of reliable principles and methods, and (3) the witness has applied the principles and methods reliably to the facts of the case.”

    The Court found that the Defendant’s arguments focused on credibility issues, which fall under the jury’s purview. As a result, the Court denied the motion.

    Case Details:

    Case caption: Culley V. Edwards Manufacturing Company Of Albert Lea
    Docket Number: 7:20cv7346
    Court: United States District Court for the Southern District of New York
    Dated: December 17, 2024
  • Industrial Engineering Expert Witness’ Testimony Admitted Despite Reliance on Tools not Adopted by any Industry

    Industrial Engineering Expert Witness’ Testimony Admitted Despite Reliance on Tools not Adopted by any Industry

    A district judge in Texas admitted the testimony of an industrial engineering and workplace ergonomics expert in order to get a better sense of the lifting activities performed by the Plaintiff on the date of her alleged injury.

    Plaintiff (“Yoakum”) filed this personal injury lawsuit against Tyson after an injury she allegedly sustained while working the night shift at the Tyson Foods beef processing plant in Amarillo, Texas. Yoakum’s alleged injuries stemmed from her lifting a 97-pound box of meat off a conveyor belt to place it onto a pallet. When Yoakum lifted the box to place it onto the pallet, she alleged that she felt a pop in her back that was accompanied by pain. 

    On October 20, 2023, Yoakum served on Tyson the expert reports of her retained experts, which included Adam W. Pickens, P.h.D—whom she retained to opine on lifting safety and the risks associated with her lifting the 97-pound box. Pickens opined that Yoakum lifting a 97-pound box created a high risk of injury. His opinion relied on two tools that are not adopted by any industry, including the meatpacking industry: (1) the NIOSH Lifting Equation (“the Lifting Equation”) and (2) the Liberty Mutual Psychophysical Tables (“the Liberty Mutual Tables”).

    Industrial Engineering Expert Witness

    Adam W. Pickens is an expert in industrial engineering and workplace ergonomics. He holds a Bachelor’s degree in Biomedical Sciences and a Master’s of Public Health in Environmental and Occupational Health from Texas A&M University. He holds a Ph.D. in Industrial Engineering from Texas Tech University in Lubbock, Texas. Pickens worked as a graduate researcher and in industry for Alliant Techsystems. He was a NIOSH trainee and served as a scientific review expert for them for over 10 years. Since 2008 he has been on the faculty of Texas A&M University in the School of Public Health.

    Want to know more about the challenges Adam Pickens has faced? Get the full details with our Challenge Study report.

    Discussion by the Court

    Tyson’s motion to exclude Pickens is focused on three arguments. First, Tyson argued that Pickens’ use of the Lifting Equation is inadequate and unreliable because he did not input values and “actually run” the Lifting Equation. Second, Tyson argued that neither the Lifting Equation, nor the Liberty Mutual Tables have been accepted in the meatpacking industry—or any industry—as the industry standard. Third, Tyson argued that Pickens’ opinion was unnecessary to assist the jury in understanding the evidence or answering any fact questions in the case because he failed to address key facts and circumstances of the case.

    A. Pickens’ testimony is based upon sufficient facts and data

    The Court observed that Pickens reviewed relevant filings on the docket, Yoakum’s employment files, Tyson’s “Safe Lifting Training” and “Lifting Do’s and Don’ts”, the depositions of Yoakum and her coworkers, and Pickens was provided with the weight of the box Yoakum was lifting when she allegedly injured her back. 

    He relied on two foundational works/tools: the NIOSH Lifting Equation—which has been accepted as reliable by several federal courts—and the Liberty Mutual Psychophysical Tables. 

    The Court noted Pickens’ substantial experience as an expert in workplace ergonomics and his experience as a NIOSH Trainee, for which he has served as a scientific review expert for over 10 years. Pickens also relied upon scientific literature and industry materials to use his expertise to form an opinion on Yoakum’s lifting task in this case.

    The Court found the facts and data Pickens relied upon to be sufficient and of the type reasonably relied upon by experts in the field of biomechanics, ergonomics, and workplace safety.

    B. Pickens’ testimony is the product of reliable principles and methods, and Pickens applied those principles and methods reliably to the facts of the case

    1. NIOSH Lifting Equation

    Pickens’ testimony relied in part on the NIOSH Lifting Equation. The Lifting Equation is a tool used to estimate safe lifting limits for the average adult in the workplace. Specifically, the Lifting Equation was developed by NIOSH to quantify injury risks associated with manual lifting. The Lifting Equation consists of a load constant (51 pounds) that is then multiplied by six variables that only serve to decrease the load constant. In other words, regardless of the values input into the variables, the highest output the Lifting Equation will ever produce is 51 pounds.

    The Court found that the Daubert factors suggested that the Lifting Equation is sufficiently reliable to form the basis of expert testimony.

    As to the first factor, the NIOSH Lifting Equation can be and has been tested. Likewise, the Lifting Equation has been subjected to peer review and publication; thus, the second factor is met. As to the fourth factor, the NIOSH Lifting Equation appears to be accepted in the field of ergonomics and workplace safety. Pickens acknowledged that the NIOSH Lifting Equation has not been explicitly adopted by any industries, including the meatpacking industry, but that it is applicable to the work force at large. The fifth factor is also satisfied as there is no evidence whatsoever that the NIOSH Lifting Equation was developed expressly for litigation. As to the sixth factor, Pickens did not unjustifiably extrapolate from an accepted premise to an unfounded conclusion. Finally, the field of ergonomics is known to reach reliable results.

    In sum, the enumerated Daubert factors are largely applicable in this situation and weigh in favor of admitting Pickens’ expert testimony.

    2. Liberty Mutual Psychophysical Tables

    Not dissimilar from the Lifting Equation, the Liberty Mutual Tables are a tool that  Pickens used that led him to his conclusion that the box Yoakum lifted in this case exceeded the safe limit under all circumstances. According to Pickens, the Liberty Mutual Tables indicated that no female can safely lift a 97-pound box during a workday without risk of injury. Like the 51-pound limit in the Lifting Equation, the Liberty Mutual Tables established that a woman should never, under any circumstances, lift more than 83.6 pounds during a workday without risk of injury.

    The Liberty Mutual Tables, developed by Liberty Mutual Insurance, covered tasks such as lifting, lowering, pushing, or pulling. According to Pickens and his references, the Liberty Mutual Tables are the product of more than 40 years of research on lifting, lowering, pushing, pulling, and carrying and have been subjected to peer review and publication. Accordingly, the Court found that the Liberty Mutual Tables are reliable in and of themselves.

    Likewise, Pickens reliably applied the facts of this case to the Liberty Mutual Tables to form his opinions. As noted, he reviewed the litigation file, relevant documents, and was provided with the fact that the box Yoakum lifted when she allegedly injured her back was 97 pounds. The Court held that Pickens reliably applied the facts of this case to the Liberty Mutual Tables to form his opinion that Yoakum could not have lifted the 97-pound box at issue without facing a risk of injury.

    C. Pickens’ opinions are relevant

    The relevance inquiry requires the Court to consider whether the opinions of Pickens will assist the jury in understanding the evidence or answering fact questions.

    Liability in this case is dependent upon a finding of negligence; therefore, the issue before the Court is whether Pickens’ testimony will aid the jury in determining negligence. The Court found that Pickens’ testimony is sufficiently relevant and will assist the jury in understanding the lifting activities performed by Yoakum on the date of her alleged injury. In sum, Pickens’ testimony may inform the determination of whether Tyson was negligent. 

    D. Tyson’s criticisms of Pickens’ opinions are topics for cross-examination, not a basis for exclusion

    Tyson took issue with numerous aspects of Pickens’ testimony. But the aspect that Tyson focused on most is that Pickens did not input values into the Lifting Equation to calculate a Lifting Index.

    First, when asked why he “did not run” the Lifting Equation, Pickens testified that he did not have the information to input values into the variables and calculate a Lifting Index. Ultimately, Pickens concluded it is irrelevant that he did not input values into the equation and calculate a Lifting Index because the maximum weight the Lifting Equation called for without a risk of injury is 51 pounds. And in this instance, Yoakum allegedly lifted a 97-pound box, so there was no need for Pickens to run the equation. This is because no matter what values he put into the Lifting Equation, the highest possible output value would be 51 pounds; thus, Pickens’ conclusion would remain the same.

    The Court found that the best mechanism for Tyson to attack Pickens’ testimony was through cross-examination, not exclusion. 

    E. The Lifting Equation and the Liberty Mutual Tables cannot establish the standard of care; however, the tools will assist the jury in understanding the lifting activities performed by Yoakum on the date of her alleged injury

    The Lifting Equation and the Liberty Mutual Tables are not adopted by any industry as industry standards. As such, the Court agrees with Tyson that neither the Lifting Equation nor the Liberty Mutual Tables can take the place of the applicable standard of care.

    Because neither the Lifting Equation nor the Liberty Mutual Tables have been accepted by any industry, including the meatpacking industry, Yoakum cannot rely on either tool to establish the standard of care in this case. And the Court will refuse to allow testimony from Pickens to that effect. However, given his expertise, the tools he used, and his reliable application of the facts of this case, the Court permitted Pickens  to testify that Yoakum faced a risk of injury when she was asked to manually lift the 97-pound box.

    The Court held that Pickens’ testimony may rely on his application of the facts of this case to both tools he chose to utilize, but his testimony cannot establish Tyson breached its standard of care based solely on Yoakum having lifted a 97-pound box.

    Held

    The Court found the facts and data Pickens relied upon to be sufficient and of the type reasonably relied upon by experts in the field of biomechanics, ergonomics, and workplace safety. Moreover, the Court was confident that any issues Tyson had with Pickens’ methodology and opinions could be addressed on cross-examination. 

    The Court denied Tyson’s motion to exclude the testimony of Adam W. Pickens.

    Key Takeaways:

    • Pickens reliably applied the facts of this case to the Liberty Mutual Tables to form his opinion that Yoakum could not have lifted the 97-pound box at issue without facing a risk of injury. Pickens reviewed the litigation file, relevant documents, and was provided with the fact that the box Yoakum lifted when she allegedly injured her back was 97 pounds.
    • Pickens’ testimony satisfied the relevance inquiry under Daubert because it assisted the jury in understanding the lifting activities performed by Yoakum on the date of her alleged injury. 
    • Considering there are no certainties in science, the Court decided that should Tyson wish to challenge any shortcomings in Pickens’ methodology or his application of the facts to either the Lifting Equation or the Liberty Mutual Tables, it may do so through cross-examination.

    Case Details:

    Case Caption: Yoakum v. Tyson Foods Inc.
    Docket Number: 2:22cv239
    Court: United States District Court, Texas Northern
    Order Date: May 21, 2024