William J. Renner

Forensic Expert
Accident Reconstruction

William Renner joined Aperture (formerly CAC Forensics) as an Accident Reconstructionist in 2022. Will comes to this role with unique expertise from his time as a police officer. While working at the Fort Bend County Sheriff’s Office in 2019, Will joined the accident investigation team. His time with the Fort Bend County Sheriff’s Office gives him unique insight from a law-enforcement perspective when he is reconstructing accidents with Aperture.

During his time as a police officer, Will participated in professional development relating to accident reconstruction, including courses through Texas A&M Engineering Extension Service (TEEX), crash data retrieval systems training, and CRUSH training via the Collision Safety Institute (CSI), and many more.

Will spent seven years investigating single and multi-vehicle crashes involving motorcycles, passenger vehicles, and commercial motor vehicles. Will gained more than 1600 hours of Texas Commission on Law Enforcement accredited training and over 1000 vehicle crashes investigated. 430 of those crashes were documented via the State of Texas Crash Reporting system.

William J.'s Expertise

  • Passenger Vehicle Accident Reconstruction
  • Commercial Vehicle Accident Reconstruction
  • Pedestrian Accident Reconstruction


Wharton County Junior College, Wharton, Texas 

  • Law Enforcement Academy, 2016 
  • Associate of Arts, 2021 

IPTM, University of North Florida, Jacksonville, Florida 

  • Bosch CDR Technician, 2021 

Texas A&M Engineering Extension (TEEX) 

  • Intermediate Collision Investigation, 2020 
  • Advanced Collision Investigation, 2021 
  • Collision Reconstruction, 2021 
  • Pedestrian/Auto Reconstruction, 2021 

Collision Safety Institute, Inc. 

  • EDR Use in Accident Reconstruction, 2022 
  • Damage and Energy Applications (CRUSH), 2022 

Other Training

  • Field Training Officer, 2018 
  • Narcotics/Dangerous Drug Investigations, 2018 
  • Intermediate Crime Scene Investigation, 2018 
  • Vehicle Contraband Training, 2017 
  • Standardized Field Sobriety Test (SFST), 2016 

Professional Certifications

FAA Part 107 Small Unmanned Aircraft System Remote Pilot

Texas Private Investigator, License No. A11774

Work Experience

Aperture, LLC, 2022 - Current, Forensic Expert - Accident Reconstruction

Accident investigation, reconstruction, and analysis for passenger and commercial vehicles, pedestrians, and bicyclists through the employment of engineering and scientific disciplines. Production of trial and testimony aids such as accident site diagrams, charts, maps, animations, and video exhibits. 

ATA Associates, 2023, Accident Reconstructionist

Aperture, LLC (formerly CAC Forensics), 2022 - 2023, Reconstruction Technician

Collect data from accident scenes, commercial and passenger vehicles. Process data collected in with numerous software programs and provide to reconstructionist. 

Fort Bend County Sheriff’s Office, 2019 - 2022, Accident Investigations Team

Primarily responsible for fatality and serious bodily injury accidents along with minor and major motor vehicle accidents when time permitted. Ability to identify factors involved in crashes such as speed and mechanical defects. Ability to use mathematics/physics to determine what caused a crash and assign contributing factors. Interviewed suspects, victims, and witnesses regarding accidents on a weekly basis. 

Stafford Police Department, 2016 - 2019, Field Training Officer / Police Officer

Recommended to become a field training officer after two years of service. Trained/supervised new and upcoming recruits in the duties of a patrol officer. Demonstrated the professional standards of law enforcement using SPD’s policies and procedures. Evaluated the performance of the recruit based upon observations of field and office work. Provided instructive criticism and suggestions for improved performance. Provided work direction and limited supervision to the recruited officer. In addition to training, also performed my regular assigned duties as a patrol officer including investigating numerous vehicular accidents. Nominated Officer of the year in 2017. 


Accident Reconstruction

Accident Recreation

3D Animation

Investigation of Incident Scenes

Investigation of Accident Vehicles

Event Data Recorder Extraction and Analysis

Forensic Documentation of Evidence

3D Documentation of Evidence

Nighttime Visibility

Motorcycle Performance Testing

Commercial Motor Vehicle Examination

William J.'s Expertise

  • Passenger Vehicle Accident Reconstruction
  • Commercial Vehicle Accident Reconstruction
  • Pedestrian Accident Reconstruction

Relevant Services

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