Robert Campbell is an Accident Reconstructionist with GrayMatter Group, where he has investigated motor vehicle collisions since 2021. He applies a dual foundation in engineering and biomechanics to determine how crashes occur, how vehicles and occupants respond, and how those dynamics produce injury. His work focuses on producing clear, evidence-based analyses that explain the physical and biomechanical mechanisms of collisions for attorneys, insurers, and courts.

He holds bachelor’s degrees in Mechanical Engineering and Bioengineering from the University of Michigan–Dearborn. He subsequently earned a master’s degree in Biomedical Engineering and a Graduate Certificate in Injury Biomechanics from Wayne State University. These credentials provide the technical basis for evaluating both vehicle dynamics and human injury mechanisms. Additional specialized training includes Pedestrian/Bicycle Crash Investigation, extending his ability to analyze non-occupant collisions.

Before joining GrayMatter Group, Mr. Campbell conducted driver behavior research and crash investigation at the University of Michigan. He later served as a Crash Investigator with Michigan Medicine’s International Center for Automotive Medicine, where he analyzed vehicle speed, movement, and injury mechanisms in real-world collisions. That experience combined field investigation with clinical and research-oriented assessment of injury causation, giving him practical insight into how crash forces translate into specific trauma patterns.

At GrayMatter Group, he integrates that background into comprehensive collision reconstruction. He examines scene evidence, vehicle damage, electronic data, and occupant kinematics to establish sequence, speeds, and contributing factors. His analyses address both the mechanics of the crash and the biomechanical relationship between those forces and the resulting injuries, supporting determinations of causation and severity.

Mr. Campbell’s combination of engineering education, injury biomechanics training, and hands-on crash investigation experience enables him to produce reconstructions that are technically rigorous and accessible to non-engineers. He applies this expertise to a range of collision types, providing objective, evidence-based opinions that assist in resolving questions of liability, injury mechanism, and crash dynamics.

David Carrier Jr. is a qualified accident reconstructionist and associate of the GrayMatter Group. He completed the accredited
accident-reconstruction program at the Georgia Public Safety Training Center and has continued specialized education and field
work since that training. He is prepared to testify as an expert in accident reconstruction and investigation and to offer opinions
within the scope of his training, education, and experience.

Mr. Carrier began his professional career in July 2004, when, at age 17 and still in high school, he enlisted in the United
States Army. He deployed in support of Operation Iraqi Freedom and Operation Enduring Freedom and rose to the rank of staff sergeant.

He entered law enforcement in 2015 as a patrol officer with the Windsor Police Department in Windsor, Vermont. In 2016 he
joined the Savannah Police Department in Georgia. In 2022 he was assigned to the traffic investigation unit as a traffic reconstructionist and has since accumulated more than 800 hours of specialized training in accident reconstruction. He remains an investigator and accident reconstructionist with the Savannah Police Department.

He has completed ACTAR test-preparation coursework through IPTM and is a member of the National Association of Professional Accident
Reconstruction Specialists.

Mr. Carrier holds a Bachelor of Science in Criminal Justice from Post University. He is a police motorcycle instructor and teaches the Basic Police Motorcycle Operator Course for the Savannah Police Department.

Albert Felix is an accident reconstructionist with GrayMatter Group and a law enforcement professional whose career began in 2007. His background combines police service with specialized education in collision investigation, vehicle dynamics, crash data retrieval, and impaired-driving enforcement. He joined GrayMatter Group in 2026, bringing experience developed through police assignments and continued technical training.

Albert began his law enforcement career with the Delano Police Department in 2007. He became an accident reconstructionist in 2015. He continues in those roles with the Cathedral Police Department today.

Albert completed advanced accident reconstruction training. He has also completed instruction in skid-mark analysis, motor vehicle inspection, and traffic collision vehicle dynamics. In 2025, he expanded that training with motorcycle reconstruction coursework.

His technical education includes Crash Data Retrieval Technician 1 and Technician 2 training through the Institute of Police Technology and Management, along with Tesla and Hyundai/Kia crash data retrieval courses. He also completed FARO training in 2025 and earned an FAA Remote Pilot sUAS qualification in 2024. These areas complement his background in scene investigation and vehicle evidence.

He completed Advanced Roadside Impaired Driver Enforcement training in 2022, Standardized Field Sobriety Testing instructor training in 2024, and Drug Recognition Expert training in 2025. Additional education includes motorcycle officer training and vehicle racing and modified-vehicle enforcement.

At GrayMatter Group, Albert brings this combination of reconstruction education, technical training, and law enforcement experience to the analysis of traffic collisions.

Chad Bohannon is a qualified Accident Reconstructionist, who has been actively investigating motor vehicle accidents since 1997. Chad has successfully completed an accredited Accident Reconstruction training program though the Georgia Police Academy and has continued his education and involvement in this field since.

He began professional law enforcement career with the Columbus Police Department in 1996 as a patrolman. He began to specialize in fatality investigations and traffic enforcement in 2000. Chad also handled fraud claims submitted by policyholders involving motor vehicle crashes for AFLAC Insurance.

In 2013, Chad joined the Lagrange Police Department, where he joined the traffic unit; investigating serious and fatal collisions.

In 2019, Chad joined the Muscogee County Sheriff’s Office, assigned to the motor squad investigating fatality collisions in Muscogee County, Georgia. In 2023, Chad promotoed to Corporal and moved to the H.E.A.T unit which enforces specific traffic related offenses in the State of Georgia.

In 2025, Chad was promoted to Sergeant. He has continuous training throughout his career in traffic investigation, reconstruction and Impaired driving. Chad is a valued mentor, teacher and speaker for law enforcement and other interested groups about various traffic safety related topics.

Chad has been deemed an expert witness in State, Superior and Federal District Court.

Tim Dolan is a qualified accident reconstructionist and associate of GrayMatter Group. In 2011 he completed accredited accident-reconstruction training through the Contra Costa County Sheriff’s Department and has maintained continuous education and field work since that time. He also completed POST-certified motor-vehicle inspection training through the San Bernardino County Sheriff’s Department.

Mr. Dolan joined the City of Oakland, CA Police Department in June 2000. Across more than twenty-five years of service he has worked as a patrol officer, field training officer, traffic investigator, patrol sergeant, traffic lieutenant, and, presently, commander of the Department’s crime-reduction team. From 2007 through 2026 he served as a senior member of Oakland’s Fatal Accident Standby Team.

While assigned to the traffic division, he completed the Department’s full sequence of collision-investigation courses, Bosch CDR/EDR download and analysis training, motor-vehicle inspection, Drug Recognition Expert certification, and DUI checkpoint management. He has applied those skills to thousands of collision scenes from property-damage crashes through serious injury and fatality collisions. He is the Oakland Police Department’s subject-matter expert on collision investigations and on applicable laws and procedures. Additionally, he assists other agencies with collision investigations and is a sworn expert witness.

He continues to investigate collisions at every level of severity. A number of fatal traffic investigations developed into murder investigations that he carried through charging. He also responds to officer-involved shooting scenes as the forensic investigator.

Kyle is a qualified accident reconstructionist, licensed private investigator, and Principal Owner of GrayMatter Group, specializing in traffic-collision reconstruction and complex investigations. He has investigated and reconstructed motor vehicle collisions since 2003, completed accredited accident-reconstruction training through the Kentucky State Police in 2015, and maintains continuous education and field work. He is prepared to testify as an expert within the scope of his training, education, and experience.

Mr. Gray began his career in the United States Air Force in 1999, serving with joint expeditionary units and deploying twice to the Middle East before an honorable discharge. He graduated from the Butler Tech Police Academy in 2003 and served with the Cleves, Seven Mile, and New Miami Police Departments and the Hamilton County Sheriff’s Office, where he was promoted to corporal and assigned to dignitary- and VIP-protection details. He concluded his law-enforcement service with the Campbell County Police Department as officer, detective, agent, and United States Secret Service Task Force Officer, responsible for all death investigations.

In 2021 he founded GrayMatter LLC and the GrayMatter Group, which provides expert accident reconstruction and investigative services nationwide. He has investigated hundreds of fatal and serious-injury collisions, including high-profile and technically complex cases. Since 2023 he has conducted federal background investigations for the Defense Counterintelligence Agency and DHS, holds an active Top Secret clearance, and serves as a credentialed Special Investigator. That same year he joined the Cold Case Foundation as an investigator and accident-reconstruction expert; GrayMatter is the Foundation’s exclusive accident-reconstruction consulting firm.