Injury Biomechanics. Clearly Explained.

Forensic engineering, accident reconstruction, and injury severity assessment that helps attorneys understand causation and prepare for trial.

WE HELP ATTORNEYS ANSWER THE HARDEST BIOMECHANICAL CAUSATION QUESTIONS

Deep Academic and Forensic Expertise Across Multiple Disciplines Sets Hayes + Associates Apart

Hayes + Associates combines rigorous biomechanics, engineering analysis, and trial testimony to help attorneys answer the hardest causation questions. We work across catastrophic injury cases, disputed low-severity incidents, and everything in between.

Led by Wilson C. “Toby” Hayes, Ph.D., H+A brings together senior, complementary expertise in biomechanics, orthopaedics, engineering, reconstruction, tribometry, and fall analysis. The team supports plaintiffs and defendants in civil and criminal matters in state and federal courts, providing opinions that are scientifically grounded, strategically useful, and clearly explained to counsel, judges, and juries. Erik D. Power, P.E. leads our Accident Reconstruction team, testifying as an expert in mechanical engineering and biomechanics.

Learn More About Hayes + Associates

100 years of collective forensic experience

300+ peer-reviewed publications & books

90% of new matters from repeat clients & referrals

All Anatomic Regions.
All Injury Severities.
All Causes.

PRACTICE AREAS

Vehicle Collisions

Reconstruct collision dynamics, evaluate severity and occupant motion, and determine whether claimed injuries are consistent with the event.

Worker Safety

Analyze task demands, workplace forces, loading, vibration, and the relationship between work activity and injury.

Premises Safety

Examine site conditions, design, maintenance, codes, and environmental factors that may have contributed to an incident.

Sports & Recreation

Evaluate equipment, motion, loading conditions, and injury mechanisms in athletic and recreational settings.

Falls

Reconstruct movement from initiation through impact and rest using physical evidence, video, testing, and biomechanical analysis.

Criminal Matters

Reconstruct event dynamics and injury mechanisms in shootings, assaults, use-of-force matters, and abuse cases.

Products Liability

Evaluate product design, manufacture, and warnings to determine whether a defect contributed to the claimed injury.

From minor collisions and disputed soft-tissue claims to catastrophic trauma, product cases, workplace incidents, falls, shootings, assaults, and abuse matters, H+A has encountered nearly every way injuries occur.

Explore the matters H+A supports and the case examples behind its analysis.

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Cutting-edge tools.
Expected outcomes.

SERVICES

H+A supports matters from early evaluation through deposition and trial, integrating investigation, reconstruction, biomechanics, and visual communication in one coordinated workflow.

Document incident locations, preserve critical evidence, and ground later opinions in direct observation.

Site Inspections

Retrieve and analyze event data recorder information to evaluate vehicle motion, timing, and collision severity.

Black Box Downloads

Analyze event sequence, movement, forces, and physical evidence to determine how an incident occurred.

Accident Reconstruction

Formal anatomic grading of injury severity, total trauma burden and probability of survival to evaluate whether reported forces and motions did or did not cause the claimed injuries.

Biomechanical Causation Analysis

Laser Scanning

Create high-resolution 3D records of scenes, vehicles, and environments for measurement, reconstruction, and demonstration.

Measure surface conditions and slip resistance to assess fall risk and the plausibility of claimed mechanisms.

Friction Testing

Simulate and evaluate body motion during falls to assess mechanism, loading, and injury potential.

Human Fall Modeling

Explain scientifically grounded opinions in language and visuals that can withstand challenge and help judges and juries understand the evidence.

Deposition and Trial Testimony

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Technical Insight.
Legal Focus.

BUILT FOR ATTORNEYS HANDLING COMPLEX INJURY CASES

Early insight into causation, injury consistency, and the technical strengths and weaknesses that may shape case direction.

Practical Case Evaluation

Trial-Ready Support

Coordinated support through expert review, reports, deposition, demonstratives, and testimony.

From first discussion through deposition and trial, the firm keeps scope, timing, and technical priorities aligned with the case.

Technical findings organized for case strategy, mediation, deposition, and courtroom presentation.

Communication Counsel Can Use

Frequently Asked Questions

Still have questions? Take a look at the FAQ or reach out anytime.

We offer a range of solutions designed to meet your needs—whether you're just getting started or scaling something bigger. Everything is tailored to help you move forward with clarity and confidence.
Getting started is simple. Reach out through our contact form or schedule a call—we’ll walk you through the next steps and answer any questions along the way.
We combine a thoughtful, human-centered approach with clear communication and reliable results. It’s not just what we do—it’s how we do it that sets us apart.
You can reach us anytime via our contact page or email. We aim to respond quickly—usually within one business day.
We offer flexible pricing based on project type and complexity. After an initial conversation, we’ll provide a transparent quote with no hidden costs.

When a matter turns on mechanism, causation, or the relationship between forces and injury, Hayes + Associates provides scientifically grounded analysis from preliminary evaluation through deposition and trial.