About Us


Our Story

TriVec Group evolved from a company founded in 1984 by Dr. David Renfroe named Renfroe Engineering. Stan Andrews was the Lead Engineer and Accident Reconstructionist at that time who meticulously developed his skills and expertise to become a Partner. Dr. Renfroe has no retired. Stan is guiding the company forward, rebranding from Ei Consultants to TriVec Group. TriVec's focus remains Investigation, Analysis and Presentation.


We are based in Northwest Arkansas near the cities of Fayetteville, Rogers, Bentonville and Springdale. It’s a beautiful area in the middle of the Ozark Mountains. Our engineers have travel-ready equipment to easily take a flight anywhere in the US to conduct inspections, often on short notice.

Accident Reconstruction and Forensic Analysis rarely has a one size fits all solution for every client. In our opinion, the best solution is the one we build with you. There is never a charge to call and ask us about your case.


Using state of the art technology we can convey complex data and key factors in a particular event. Presentations and animations can be useful not only in a courtroom but in many cases during a deposition and often at mediation.

And If we aren't able to help you, we may be able to refer you to someone with the particular expertise you need. Over the years we have worked with many investigators from a wide range of fields.


Owner, Accident Reconstructionist

Stan Andrews

Stan Andrews is straight forward, easy to talk to and has a great sense of humor. You'll enjoy a conversation with him.

Stan has a BS and MS in Biological and Agricultural Engineering; holds two U.S. Patents and has advanced PC-Crash and FARO scanner and software training. Over the last 20 years he has investigated and reconstructed all types of ground vehicle accidents and provided expert testimony in both depositions and trials.



Drone Pilot, Visual Presentations

Mark Partain

Mark has created visual presentations
for over 500 reconstructions including trains, motorcycles, watercraft, pedestrians and
factory equipment. He has a  a BS and MS in Industrial Engineering and is ACTAR accredited.
Mark also has a FAA Part 107 SUAS Pilot License and is a WACH Certificate holder.

Mark has completed training for CDR Analyst, FARO scanner and
software and PC Crash.



Accounting Manager

Suzy Mathews

Suzy is the person to reach out to for any questions regarding invoicing, payments,
retainers and special financial situations.

Suzy holds a BS in Paralegal Studies and Associates Degree in Business Accounting and
Management. She is a member of the National Paralegal Association and completed training in LexisNexis Paralegal Mastery Program.



Documents Manager, Scheduling & Marketing

Linda Fodemski

Linda is your contact for any materials you need from us or for scheduling.

Linda started with the company in 2005 and is a member of ARMA International Professional Records Information Managers. Linda also manages the company marketing and trial presentations.