Expert Witness Directory

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Browse our verified directory of expert witnesses spanning medicine, engineering, finance, and dozens of specialized fields.

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Showing 271–288 of 1,756 experts

Police Practices & Procedures
BA

Bruce A. Champagne

Expert Witness

Sandy, UT24 years+ yrs★ 8.8

Bruce A. Champagne is an expert in aquatic crime scene investigations and law enforcement uses of force, specializing in crime and biomechanical analysis and behavioral profiling. With a career spanning law enforcement operations, tactical leadership, and forensic analysis, he brings a multidisciplinary perspective to litigation work. His work centers on investigating officer-involved incidents, assessing human performance factors, and evaluating whether law enforcement protocols were adhered to. Mr. Champagne has been retained in numerous expert witness and consulting engagements across the United States, involving cases related to police practices, human factors, and tactical operations. His Master of Public Administration degree, along with certifications such as Force Science Investigator and Behavioral Profiling, reinforce his ability to deliver objective, defensible analyses. He is regularly engaged by both plaintiff and defense counsel to provide clear, independent determinations of responsibility in disputes involving law enforcement procedures and human performance factors.

Human FactorsAquatic crime scene investigationsCrime and biomechanical analysis+10
Security
MJ

Michael Johnston

Independent Security Consultant

Henderson, NV36 years+ yrs★ 8.8

Michael Johnston, M.A., B.A., PCI, CPP, Certified Use of Force Analyst, CPD is a forensic security consulting expert specializing in premise liability and use of force litigation. With a career spanning security operations, law enforcement leadership, and forensic analysis, he brings a strategic investigative framework to his litigation work. His work centers on investigating security failures, assessing use of force incidents, and evaluating whether industry standards were met. Mr. Johnston has been retained in numerous expert witness and consulting engagements across Nevada, involving cases in casinos, hotels, and multi-housing properties. His M.A. in Organizational Culture and Leadership, along with certifications such as Professional Certified Investigator (PCI) and Certified Protection Professional (CPP), reinforce his ability to deliver objective, defensible analyses. He is regularly engaged by both plaintiff and defense counsel to provide clear, independent determinations of responsibility in disputes involving inadequate security and negligent training.

InvestigationForensic Security ConsultingExpert Witness+2
Pharmacology
JM

James M Sonner, MD

Physician-Scientist and Professor Emeritus

Rancho Santa Margarita, CA35 years+ yrs★ 8.8

James M Sonner, MD is a pharmacology and anesthesiology expert specializing in drug interactions, perioperative medication safety, and the identification of adverse drug reactions or toxic effects. With a career spanning chemistry, pharmacology, and clinical medicine, he brings a scientifically rigorous framework to litigation work involving complex pharmacological outcomes. His work centers on investigating drug interactions, assessing perioperative medication safety, and evaluating whether adverse drug reactions have occurred. Dr. Sonner has been retained in numerous expert witness and consulting engagements across the United States, involving cases related to pharmacology of the nervous system and anesthesiology. His Doctor of Medicine from Harvard Medical School, along with certifications from the American Board of Anesthesiology and the Drug Enforcement Administration, reinforce his ability to deliver objective, defensible analyses. He is regularly engaged by both plaintiff and defense counsel to provide clear, independent determinations of causation in disputes involving drug interactions and toxicology.

ToxicologyChemistryClinical Medicine+4
Athletics & Recreation
NL

Nathane L. Jackson

Certified Strength & Conditioning Specialist | Registered Holistic Nutritionist | Fitness & Biomechanics Expert

Niagara Falls, Ontario25 years+ yrs★ 8.8

Nathane L. Jackson, BA, CSCS, RHN is a Fitness & Biomechanics Expert specializing in fitness facility liability, exercise biomechanics, and injury prevention standards. With a career spanning strength and conditioning coaching, holistic nutrition, and fitness facility management, he brings a multifaceted perspective to litigation work. His work centers on investigating fitness injury causation, assessing trainer negligence, and evaluating whether safety compliance standards were met. Mr. Jackson has been retained in numerous expert witness and consulting engagements across Canada and the United States, involving personal injury cases related to fitness instruction and facility operations. His Bachelor of Arts in Sociology, along with certifications such as Certified Strength & Conditioning Specialist and Registered Holistic Nutritionist, reinforce his ability to deliver objective, defensible analyses. He is regularly engaged by both plaintiff and defense counsel to provide clear, independent determinations of causation in disputes involving exercise biomechanics and trainer conduct.

BiomechanicsFitness facility standards and operationsExercise biomechanics and injury causation+6
Medical Devices
KR

Karl R. Leinsing

MSME, PE

Dover, NH35 years+ yrs★ 8.8

Karl R. Leinsing, MSME, PE is a medical device engineering expert specializing in full life cycle medical device product development and consulting. With a career encompassing mechanical engineering, regulatory compliance, and innovative design, he brings a comprehensive framework to litigation work involving complex product development and patent disputes. His work centers on investigating patent infringement, assessing product liability, and evaluating whether industry standards were met in medical device development. Mr. Leinsing has been retained in numerous expert witness and consulting engagements across the United States, Canada, EPO, USPTO, ITC, and Australia, involving patent and liability cases in the medical device industry. His M.S. in Mechanical Engineering from North Carolina A&T State University, along with his Professional Engineer license in NH, reinforce his ability to deliver objective, defensible analyses. He is regularly engaged by both plaintiff and defense counsel to provide clear, independent determinations of causation in disputes involving medical device design and functionality.

Mechanical EngineeringMedical device product development
Animations
ES

E. Steyn Visagie

Professional Land Surveyor, Forensic Animator

Dana Point, CA25 years+ yrs★ 8.8

E. Steyn Visagie, Professional Land Surveyor, Forensic Animator, FAA Certified Drone Pilot is a forensic animation and scene reconstruction expert specializing in surveying, mapping, and spatial analysis for litigation. With a career spanning forensic animation, scene mapping, and spatial data visualization, he brings a comprehensive framework to analyzing complex accident and incident reconstructions. His work centers on investigating scene dynamics, assessing spatial data accuracy, and evaluating whether visual demonstratives align with factual evidence. Mr. Visagie has been retained in numerous expert witness and consulting engagements across California and Virginia, involving accident reconstructions, public sector surveying, and transportation incidents. His BSc. in Surveying from the University of Cape Town, along with his Professional Land Surveyor licenses in California and Virginia, reinforce his ability to deliver objective, defensible analyses. He is regularly engaged by both plaintiff and defense counsel to provide clear, independent determinations of causation in disputes involving scene reconstruction and forensic animation.

Land SurveyingSurveyingMapping+2
Employment and Management
MC

Maureen Clark

Human Resource Management, Expert Witness Consultation

Menlo Park, CA56 years+ yrs★ 8.8

Maureen Clark, SHRM-SCP, SPHR-CA is a Human Resource Management expert specializing in employment and management litigation. With a career spanning infrastructure development, problem-solving, and neutral fact-finding, she brings a comprehensive framework to her litigation work. Her work centers on investigating workplace practices, assessing compliance with HR standards, and evaluating whether employment policies have been properly implemented. Ms. Clark has been retained in numerous expert witness and consulting engagements across the United States, involving high tech, manufacturing, services, not-for-profit, education, and public sectors. Her M. Ed. in Counseling from San Jose State University, along with certifications such as SHRM-SCP and SPHR-CA, reinforce her ability to deliver objective, defensible analyses. She is regularly engaged by both plaintiff and defense counsel to provide clear, independent determinations of responsibility in disputes involving employment practices, wrongful termination, and workplace discrimination.

InfrastructureProblem solvingNeutral fact-finding+1
Transportation Engineering
SW

Shane W. Niemann, P.E.

Mechanical Engineer

Orlando, FL14 years+ yrs★ 8.8

Shane W. Niemann, P.E. is a mechanical system failure analysis expert specializing in accident reconstruction involving motor vehicles, cranes, forklifts, tractors, heavy equipment, and pedestrians. With a diverse background in engineering consulting, project management, and mechanical systems design, he brings a multidisciplinary perspective to litigation work. His work centers on investigating mechanical failures, assessing construction defects, and evaluating product defects. Mr. Niemann has been retained in numerous expert witness and consulting engagements throughout Florida, involving transportation engineering, traffic safety, and construction defect cases. His Bachelor of Science in Mechanical Engineering, along with certifications such as Professional Engineer - Florida and sUAS Remote Pilot in Command, reinforce his ability to deliver objective, defensible analyses. He is regularly engaged by both plaintiff and defense counsel to provide clear, independent determinations of causation in disputes involving mechanical system failures and accident reconstructions.

Traffic SafetyTraffic ManagementRoad Safety Audits+10
Insurance
SS

Scott S. Margraves

CIC

Houston, Texas33 years+ yrs★ 8.8

Scott S. Margraves, CIC is an insurance industry expert specializing in property and casualty insurance interpretation and litigation. With a career encompassing diverse roles in insurance brokerage, claims supervision, and risk management, he brings a multifaceted perspective to his litigation work. His work centers on investigating policy compliance, assessing contractual obligations, and evaluating whether industry standards have been met. Mr. Margraves has been retained in numerous expert witness and consulting engagements across Arkansas, Colorado, Illinois, Louisiana, New Mexico, and Texas, involving cases of Bad Faith, Agency E&O, and Marine insurance, among others. His Bachelor of Science in Economics, along with his Certified Insurance Counselors (CIC) certification, reinforce his ability to deliver objective, defensible analyses. He is regularly engaged by both plaintiff and defense counsel to provide clear, independent determinations of standard of care in disputes involving complex insurance matters.

Real EstateBad FaithAgency E&O+6
Electronics
RO

Robert O. Peruzzi

PhD, PE, DFE

Bethlehem, PA35 years+ yrs★ 8.8

Robert O. Peruzzi, PhD, PE, DFE is a forensic electrical engineering expert specializing in intellectual property, patents, and product liability litigation. With a career encompassing electronics engineering, integrated circuits, and control systems, he brings a nuanced understanding of technical complexities to his litigation work. His work centers on investigating electrical failures, assessing patent infringement, and evaluating whether product specifications meet industry standards. Mr. Peruzzi has been retained in numerous expert witness and consulting engagements across the United States, involving cases related to electronics, communication systems, and personal injury from electrical failures. His PhD in Electrical Engineering, along with his Professional Engineer license in PA and Board Certification in Forensic Engineering, reinforce his ability to deliver objective, defensible analyses. He is regularly engaged by both plaintiff and defense counsel to provide clear, independent determinations of causation in disputes involving electrical and electronic systems.

EngineeringForensic EngineeringElectrical Engineering+2
Computer Graphics
MA

Michael A. Trousdale, Ph.D.

Principal Software & Technology Consultant

Los Angeles, CA21 years+ yrs★ 8.8

Iman Sadeghi, Ph.D. is a software and technology consulting expert specializing in software litigation. With a career enriched by experiences at prestigious organizations such as Google, Walt Disney Animation Studios, and Lucasfilm, he brings a multifaceted perspective to his litigation work. His work centers on analyzing complex software systems, evaluating software production quality, and elucidating software functionalities. Dr. Sadeghi has been retained in numerous expert witness and consulting engagements across the United States, involving cases related to patent infringement, trade secret misappropriation, and intellectual property violations. His Ph.D. in Computer Science from the University of California, San Diego, along with his extensive experience in software engineering and system architecture, reinforce his ability to deliver objective, defensible analyses. He is regularly engaged by both plaintiff and defense counsel to provide clear, independent determinations of causation in disputes involving software engineering and intellectual property.

3D Rendering3D Animation3D Geometry Processing+16
Environmental Engineering
MO

Mark O. Barnett

Professor of Environmental Engineering

Auburn, AL38 years+ yrs★ 8.8

Mark O. Barnett, P H.D., P.E., BCEE is an Environmental Engineering expert specializing in water and wastewater treatment, site assessment and remediation, and soil and groundwater contamination. With a career spanning academia, industry, and government roles, he brings a multidisciplinary perspective to litigation work. His work centers on investigating contaminant behavior, assessing environmental risks, and evaluating compliance with environmental regulations. Mr. Barnett has been retained in numerous expert witness and consulting engagements across the United States, involving environmental engineering, hazardous waste management, and nuclear environmental engineering cases. His Ph.D. in Environmental Sciences and Engineering, along with his status as a Licensed Professional Engineer and Board Certified Environmental Engineer, reinforce his ability to deliver objective, defensible analyses. He is regularly engaged by both plaintiff and defense counsel to provide clear, independent determinations of causation in disputes involving environmental contamination and remediation.

Water and wastewater treatmentSite assessment and remediationSoil and groundwater contamination+6
Construction Defects
MS

Mark S. Densmore

Board-Certified Forensic Engineer

Lakewood Ranch, FL30 years+ yrs★ 8.8

Mark S. Densmore, P.E., S.I., DFE, FRSE, MLE is a forensic structural engineering expert specializing in forensic property damage investigations and evaluations. With a career spanning structural design, forensic investigations, and expert witness testimony, he brings a comprehensive forensic framework to litigation work. His work centers on investigating construction defects, assessing structural damage, and evaluating whether building code violations have occurred. Mr. Densmore has been retained in numerous expert witness and consulting engagements across Florida, involving cases related to construction defects, hurricane damage, and roofing system failures. His Bachelor of Science in Civil Engineering from Worcester Polytechnic Institute, along with certifications such as Board-Certified Diplomate in Forensic Engineering and Florida-Recognized Structural Engineer, reinforce his ability to deliver objective, defensible analyses. He is regularly engaged by both plaintiff and defense counsel to provide clear, independent determinations of causation in disputes involving structural failures and property damage.

Structural EngineeringForensic property damage investigationsStructural design and analysis
Construction
CJ

Colby J. Walter

CAPS, GMB, CGP

Farmington, UT25+ years+ yrs★ 8.8

Colby J. Walter, CAPS, GMB, CGP is a construction expert specializing in construction defects and management litigation. With a career spanning residential development, commercial construction, and expert witness consulting, he brings a multifaceted perspective to litigation work. His work centers on investigating construction defects, assessing project management practices, and evaluating whether industry standards were met. Mr. Walter has been retained in numerous expert witness and consulting engagements across Utah and Idaho, involving residential and commercial construction cases. His Bachelor of Science in Construction Management, along with certifications such as Certified Green Professional (CGP), Graduate Master Builder (GMB), and Certified Aging-In-Place Specialist (CAPS), reinforce his ability to deliver objective, defensible analyses. He is regularly engaged by both plaintiff and defense counsel to provide clear, independent determinations of responsibility in disputes involving construction management and defects.

Construction DefectsConstruction ManagementResidential Development+2
Human Factors
ES

Ellen Szubski

Human Factors Consultant

Irmo, SC7 years+ yrs★ 8.8

Ellen Szubski, M.S., Ph.D., CXLT, CPSI, AHFP is a Human Factors Consultant specializing in premises liability and safety evaluations. With a career encompassing human factors analysis, safety compliance, and risk management, she brings a multifaceted perspective to litigation work. Her work centers on investigating slip, trip, and fall incidents, assessing vehicle and pedestrian crash dynamics, and evaluating whether OSHA standards were met in workplace injuries. Ms. Szubski has been retained in numerous expert witness and consulting engagements across the southeastern United States, involving cases related to premises liability, public playground incidents, and vehicle/pedestrian/bicycle crash investigations. Her Doctor of Philosophy in Human Factors Psychology, along with certifications such as Certified XL Tribometrist and Certified Playground Safety Inspector, reinforce her ability to deliver objective, defensible analyses. She is regularly engaged by both plaintiff and defense counsel to provide clear, independent determinations of causation in disputes involving human factors and safety compliance.

Premises LiabilityHuman Factors & SafetyIllumination Evaluation+5
Child trauma evaluations
SS

Stephanie Susanne Wolf

Forensic Psychologist

Washington, DC16 years+ yrs★ 8.8

Stephanie Susanne Wolf, J.D., Ph.D. is a forensic psychology expert specializing in child trauma evaluations and parenting capacity assessments. With a career encompassing clinical psychology, legal expertise, and academic instruction, she brings a multidisciplinary perspective to her litigation work. Her work centers on investigating patterns of child sexual abuse, assessing the impact of trauma on children, and evaluating the disclosure processes in abuse cases. Ms. Wolf has been retained in numerous expert witness and consulting engagements across Maryland and Washington DC, involving cases of child abuse, custody disputes, and psychological trauma. Her Doctor of Philosophy in Clinical Psychology, along with certifications such as Problematic Sexual Behavior - Cognitive Behavioral Therapy (PSB-CBT) Certified Trainer, reinforce her ability to deliver objective, defensible analyses. She is regularly engaged by both plaintiff and defense counsel to provide clear, independent determinations of causation in disputes involving child trauma and abuse.

Parenting capacity evaluationsTrauma expertise in sexual abuse and assaultAutism Spectrum Disorder and child trauma+2
Strategic planning, design, and optimization of logistics networks
ST

Stephen T. (Steve) Hopper, P.E.

Founder and Principal

Canton, GA37 years+ yrs★ 8.8

Stephen T. Hopper, P.E. is a supply chain operations expert specializing in litigation involving warehousing, fulfillment, distribution, and logistics operations. With a career spanning strategic planning, logistics network design, and supply chain solutions, he brings a comprehensive framework to litigation work. His work centers on investigating operational efficiencies, assessing compliance with industry standards, and evaluating whether safety protocols were followed. Mr. Hopper has been retained in numerous expert witness and consulting engagements across the United States, Canada, and Australia, involving cases related to supply chain operations. His Bachelor of Industrial Engineering (BIE) in Industrial Engineering from The Georgia Institute of Technology, along with his Professional Engineer (P.E.) license, reinforce his ability to deliver objective, defensible analyses. He is regularly engaged by both plaintiff and defense counsel to provide clear, independent determinations of responsibility in disputes involving logistics and supply chain management.

Conception, modeling, analysis, reengineering, design, and activity-based costing (ABC) of warehousing, fulfillment, distribution, and logistics operations and business processesBusiness OperationsEngineering+14
Failure Analysis
DD

Dr. Daniel R. Foster

Expert Welding Engineering and Inspection

Norfolk, VA18 years+ yrs★ 8.8

Dr. Daniel R. Foster, PE is a welding engineering expert specializing in the design, production, testing, and safety of welded structures. With a wealth of experience in both academia and industry, he brings a unique perspective to litigation work, particularly in analyzing failures and addressing challenges in welded structures. His work centers on investigating welding failures, assessing welding safety, and evaluating whether welding codes compliance has been met. Dr. Foster has been retained in numerous expert witness and consulting engagements across the United States, involving cases related to welding failures, industrial safety, and compliance with welding codes. His Doctor of Philosophy in Welding Engineering from The Ohio State University, along with certifications such as Certified Welding Inspector (CWI) and Professional Engineer (PE), reinforce his ability to deliver objective, defensible analyses. He is regularly engaged by both plaintiff and defense counsel to provide clear, independent determinations of causation in disputes involving welding engineering and inspection.

SafetyWelding EngineeringWeld Inspection+3
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