Find the Right Expert for Every Case

PhD, CPE, ACTAR

John D Lloyd, PhD, CPE, ACTAR is a motorcycle accident reconstruction expert specializing in injury biomechanics and human factors. With a career spanning over three decades in biomechanics research and advanced motorcycle dynamics, he brings a nuanced understanding of crash causation and helmet efficacy to litigation work. His work centers on investigating motorcycle accident dynamics, assessing helmet performance in crash scenarios, and evaluating whether human factors contributed to incident outcomes. Mr. Lloyd has been retained in numerous expert witness and consulting engagements across the United States and Great Britain, involving motorcycle accidents, helmet safety, and human factors analysis. His PhD in Ergonomics (Human Factors Engineering) with a specialization in biomechanics, along with Board Certification in Professional Ergonomics and ACTAR Accreditation, 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 motorcycle dynamics and helmet performance.

Principal Architect

Bradley C. Hammerstrom, AIA, NCARB is a construction defects expert specializing in building envelope matters and code compliance. With a career spanning architecture, forensic analysis, and quality assurance, he brings a comprehensive architectural framework to litigation work. His work centers on investigating construction defects, assessing code compliance, and evaluating whether installation standards were met. Mr. Hammerstrom has been retained in numerous expert witness and consulting engagements across California, Texas, and other states, involving construction defect cases in residential and commercial properties. His Bachelor of Architecture in Architecture from California Polytechnic State University, along with certifications from the American Institute of Architects (AIA) and the National Council of Architectural Registration Boards (NCARB), 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 building envelope and construction defects.

Principal

Rico Ashley, P.E. is a power engineering expert specializing in National Electrical Code (NEC) compliance, National Electrical Safety Code (NESC) compliance, and power generation construction standards. With a career spanning electrical engineering, power generation commissioning, and protective relaying standards, he brings a comprehensive understanding of industry-specific compliance and safety protocols to his litigation work. His work centers on investigating NEC and NESC compliance, assessing power generation construction standards, and evaluating whether protective relaying standards and coordination have been properly implemented. Mr. Ashley has been retained in numerous expert witness and consulting engagements across Florida, Georgia, and Texas, involving cases related to electrical safety, power generation, and arc flash compliance. His Bachelor of Science in Electrical Engineering from Tuskegee University, along with his Professional Engineering Licenses in Florida, Nebraska, and Texas, reinforce his ability to deliver objective, defensible analyses. He is regularly engaged by both plaintiff and defense counsel to provide clear, independent determinations of compliance and safety standards in disputes involving electrical engineering and power systems.

Owner & Manager

Larry W. Busby is an accident reconstruction and land surveying expert specializing in accident investigation and reconstruction. With a career spanning private investigation, land surveying, and accident reconstruction, he brings a multidisciplinary perspective to litigation work. His work centers on investigating accident causation, assessing scene mapping accuracy, and evaluating whether industry standards were met. Mr. Busby has been retained in numerous expert witness and consulting engagements across Texas, New Mexico, Colorado, and Oklahoma, involving automotive, pedestrian, commercial vehicle, and land surveying cases. His Bachelor’s Degree in Criminal Justice, along with certifications such as the Accreditation Commission for Accident Reconstruction (ACTAR) and Certified Federal Surveyor (CFedS), 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 accident reconstruction and land surveying.

FAIA, NCARB, LEED AP, CRRP

Gary K. Dempster, FAIA, NCARB, LEED AP, CRRP is an architecture and construction expert specializing in professional standard of care and construction documents analysis. With a career spanning project management, technical services, and architectural mediation, he brings a comprehensive framework for evaluating compliance with industry standards in complex construction disputes. His work centers on investigating professional standard of care breaches, assessing construction document integrity, and evaluating whether architectural coordination meets regulatory requirements. Mr. Dempster has been retained in numerous expert witness and consulting engagements across the United States, involving retail, hospitality, and historic preservation projects. His Bachelor of Science in Architecture from the University of Southern California, along with certifications such as NCARB, LEED AP, and CRRP, 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 architectural design and construction administration.

Forensic Animator/Technical Animator/Legal Graphic Designer/Medical Illustrator

David Yarr is a forensic animation and visualization expert specializing in accident reconstruction and legal graphics. With a career spanning forensic animations, accident reconstruction visualization, and medical illustrations, he brings a multidisciplinary approach to litigation work. His work centers on producing demonstrative evidence, conducting video analysis, and integrating EDR/black box data. Mr. Yarr has been retained in numerous expert witness and consulting engagements across the United States, involving personal injury cases, vehicle collisions, and medical device litigations. His coursework in Digital Animation, along with certifications such as LEVA Level 1, Forensic Video Analysis & the Law, 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 accident scenarios and forensic visualizations.

Certified Safety Professional

Cheryl Scanlon-Zinner, CSP is a safety management and OSHA compliance expert specializing in workplace injury prevention and litigation support. With extensive experience across safety program development, hazard evaluation, and incident investigation, she brings a comprehensive framework to analyzing safety responsibilities and compliance with industry standards. Her work centers on investigating worker injury causation, assessing compliance with OSHA standards, and evaluating whether safety management practices meet the standard of care. Ms. Scanlon-Zinner has been retained in numerous expert witness and consulting engagements across the United States, involving construction safety, industrial safety, and OSHA compliance cases. Her Bachelor of Science in Environmental Science, along with certifications such as Certified Safety Professional (CSP) and Authorized OSHA Outreach Trainer for Construction, 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 construction safety, fall protection, and OSHA compliance.

Principal, Forensic Architect

Christopher D. Ling, AIA, NCARB, PP, LEED AP, CCT is a forensic architecture expert specializing in construction litigation and architectural standard of care. With a career spanning architectural design, construction defect analysis, and expert testimony, he brings a comprehensive understanding of construction project intricacies to his litigation work. His work centers on investigating construction defects, assessing architectural standards of care, and evaluating whether building codes have been adhered to. Mr. Ling has been retained in numerous expert witness and consulting engagements across the United States, involving complex construction defect cases and architectural standard of care disputes. His Bachelor of Architecture in Architecture, along with certifications such as the NCARB Certificate and Certified Cost Technician (CCT), 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 claims and architectural practices.

Licensed Professional Engineer | Construction Expert Witness | Principal Expert, GCM Group LLC

Walter McBrier, P.E. is a construction expert witness specializing in delay analysis, cost causation, change order disputes, and schedule impact assessment. With a career spanning roles as a contractor, owner's representative, and project controls lead, he brings a technically rigorous framework to litigation work. His work centers on investigating construction delays, assessing cost responsibilities, and evaluating whether contract obligations have been met. Mr. McBrier has been retained in numerous expert witness and consulting engagements across the United States, involving commercial, industrial, heavy civil, and utility infrastructure sectors. His Bachelor of Science in Mechanical Engineering, along with his Licensed Professional Engineer (Civil) certification in Idaho, 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 construction delay and cost issues.

Certified Public Accountant

EJ Janik, CPA, CFF, CFE, CFLC is a forensic accounting expert specializing in business dispute consulting and fraud analyses. With a career spanning forensic accounting, fraud investigations, and construction claims, he brings a multifaceted analytical framework to litigation work. His work centers on investigating financial discrepancies, assessing business damages, and evaluating whether industry standards were met in complex financial disputes. Mr. Janik has been retained in numerous expert witness and consulting engagements across the United States, involving cases in industries such as construction, energy, and real estate. His Master of Science in Accounting from Louisiana State University, along with certifications as a Certified Public Accountant, Certified in Financial Forensics, Certified Fraud Examiner, and Certified Forensic Litigation Consultant, 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 forensic accounting and fraud investigations.

Tire, Fire & Automotive Consultant

Thomas J. Lepper, CFEI is an automotive failure analysis expert specializing in forensic investigation and fire cause and origin. With a career spanning tire and brake analysis, mechanical defect evaluation, and vehicle theft analysis, he brings a comprehensive forensic perspective to litigation work. His work centers on investigating tire separations and failures, assessing fire cause and origin, and evaluating mechanical defects. Mr. Lepper has been retained in numerous expert witness and consulting engagements across California, involving automotive failures, tire and brake analysis, and fire cause investigations. His Bachelor of Science in Education from Southern Illinois University, along with his Certified Fire and Explosion Investigator 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 causation in disputes involving automotive component failures and fire origins.

Use-of-Force Expert Witness

Mitchell Lee Lathrop is a use-of-force expert specializing in firearms and ballistics, human factors, and use-of-force reasonableness. With a career spanning defensive shooting dynamics, counter-ambush training, and policy and standards analysis, he brings a nuanced understanding of human performance under stress to litigation work. His work centers on investigating use-of-force incidents, assessing decision-making processes, and evaluating whether actions align with established standards. Mr. Lathrop has been retained in numerous expert witness and consulting engagements across the United States, involving complex insurance coverage issues, environmental insurance, and lawyers' professional responsibility. His B.Sc. in Engineering from the United States Naval Academy and J.D. from the University of Southern California Law School, along with certifications such as Certified Force-Science Analyst and USCCA Defensive Shooting Instructor, 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 use-of-force incidents and insurance law.

Consulting Engineer in Civil Engineering

Keith A. Bergman, PE is a civil engineering expert specializing in highway and street design, traffic engineering, and utilities construction. With extensive experience in construction management, project-related claims, and job site safety, he brings a comprehensive understanding of codes and standards to his litigation work. His work centers on investigating premise liability, assessing pedestrian safety, and evaluating whether ADA compliance has been met. Mr. Bergman has been retained in numerous expert witness and consulting engagements across the United States, involving premises liability, traffic engineering, and construction management cases. His Bachelor of Science Degree in Civil Engineering from San Diego State University, along with his Professional Engineer certifications in multiple states, 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 walkway surface evaluations, storm drainage, and pedestrian safety.

Supervising Civil Engineer – Transportation / Signals / ITS

Jocelyn Mamchur, PE is a transportation engineering expert specializing in traffic signal systems and Intelligent Transportation Systems (ITS) litigation. With extensive experience in municipal engineering and public agency standards, she brings a nuanced understanding of design compliance and safety analysis to her litigation work. Her work centers on investigating traffic signal failures, assessing compliance with engineering standards, and evaluating whether deviations from the Manual on Uniform Traffic Control Devices (MUTCD) have occurred. Ms. Mamchur has been retained in numerous expert witness and consulting engagements across the Pacific Northwest, involving municipal liability and pedestrian safety cases. Her Bachelor of Science in Engineering from the University of Manitoba, along with her Professional Engineer (PE) license in Washington State, reinforce her ability to deliver objective, defensible analyses. She is regularly engaged by both plaintiff and defense counsel to provide clear, independent determinations of standard of care in disputes involving traffic control devices and roadway lighting.

Registered Professional Engineer

Harold E. von Dran Jr., PE is an Environmental Engineering expert specializing in environmental litigation and regulatory compliance. With a career spanning environmental program management, construction defect analysis, and regulatory negotiations, he brings a strategic framework to litigation work. His work centers on investigating environmental contamination, assessing regulatory compliance, and evaluating infrastructure design failures. Mr. von Dran has been retained in numerous expert witness and consulting engagements across Texas, Arkansas, Louisiana, and beyond, involving environmental contamination cases, construction defects, and regulatory compliance disputes. His MS in Environmental Science, along with his Certified Energy Manager designation, 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 impact assessments and facility design compliance.

MS, PE

Ryan D. Cook, MS, PE is a mechanical engineering expert specializing in firearms and ballistics litigation. With a career encompassing design engineering, failure analysis, and intellectual property, he brings a comprehensive understanding of product liability and safety standards to his litigation work. His work centers on investigating component failures, assessing product liability claims, and evaluating whether manufacturing standards have been met. Mr. Cook has been retained in numerous expert witness and consulting engagements across the United States, involving firearms, consumer electronics, and manufacturing hardware. His Master of Science in Mechanical Engineering from Brigham Young University, along with his Professional Engineer (PE) 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 causation in disputes involving firearms and mechanical failures.

Expert Witness

John E. Skidmore, P.E. is a civil engineering expert specializing in forensic analysis related to drainage, flooding, and structural damage. With a career spanning land planning, surveying, hydrology, and geotechnical engineering, he brings a multidisciplinary perspective to litigation work. His work centers on investigating water intrusion causes, assessing structural impacts from external forces, and evaluating whether construction defects contributed to property damage. Mr. Skidmore has been retained in numerous expert witness and consulting engagements across the United States, involving cases such as drainage disputes, water intrusion claims, and structural damage assessments. His Bachelor of Science in Civil Engineering from Southern Methodist University, along with certifications such as the NCEES Council Record and FAA Remote Pilot 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 causation in disputes involving hydrology, structural integrity, and environmental impacts.

Expert Witness Architect

Fred Lott, AIA, ARA, CSI is an Expert Witness Architect specializing in construction defects, standard of care, and responsibility & compliance litigation. With a career spanning architecture, construction management, and owner representation, he brings a multidisciplinary approach to his litigation work. His work centers on investigating construction defects, assessing compliance with industry standards, and evaluating whether contractual obligations have been met. Mr. Lott has been retained in numerous expert witness and consulting engagements across the United States, involving complex construction and architectural disputes. His Bachelor of Architecture from Ball State University, along with certifications such as Multi-Protection Design from the Department of Defense and ICBO certifications, 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 defects and compliance with architectural standards.