NHTSA Event | Guest Bios

Latest Event

Speed Prevention National Campaign Kickoff Event

July 2, 2026

Captain James T. Williams

Traffic Division Commander, Metropolitan Nashville Police Department

Capt. James T. Williams is an 18-year veteran of the Metropolitan Nashville Police Department and commander of its traffic division. Throughout his career, Williams has specialized in traffic safety, rising from patrol officer and crash reconstructionist to supervisor of the DUI enforcement unit and manager of fatal crash investigations. A leader in data-driven policing, he was selected as a National Institute of Justice LEADS Scholar and serves as a co-chair within the International Association of Chiefs of Police’s police research advancement section. 

Williams holds a bachelor's degree from the University of Kentucky and a master's degree in public policy and administration from Northwestern University, where his graduate research focused on using predictive analytics in traffic enforcement to reduce roadway fatalities.

Justin Marks

Trackhouse Racing Owner and NASCAR Guest Driver

Justin Marks competed across NASCAR's top three national series — the Cup Series, Xfinity Series and Craftsman Truck Series — over more than a decade behind the wheel, earning his first NASCAR victory in a 2016 Xfinity Series race at Mid-Ohio Sports Car Course. Before turning to stock cars, he built a successful sports car career in the Rolex Sports Car Series and the Continental Tire Sports Car Challenge, and he later returned to road racing in the IMSA WeatherTech SportsCar Championship with Michael Shank Racing. 

In 2020, Marks founded Trackhouse Racing, the NASCAR Cup Series team he co-owns. The team fields cars for drivers including Ross Chastain and Daniel Suárez, and it operates on a cause-marketing model that uses the team's national platform to support STEM education and community-focused programming.

Brittany Leedham

Advocate

Brittany Leedham’s life was forever changed on Nov. 29, 2008, when she was headed home with her boyfriend, who lost control while passing another car at 70 mph, as the car went airborne 9 feet and smashed into a tree. She sustained life-threatening injuries, including broken tibia and fibula bones, both femurs and neck trauma. After more than 25 surgeries and 12 weeks in the hospital, Leedham has rods, plates, screws and anchors in both legs that are completely skin-grafted.

Leedham is now a motivational speaker who delivers impactful presentations on safe driving, resilience and the power of personal choices. Her authentic and relatable approach leaves audiences inspired, challenged and empowered to make decisions that can change the course of a life.