William Alexander Lester III is racing driver who competes in the Daytona Prototype category in the Rolex Sports Car Series. In 1984, he earned a Bachelor of Science degree in EECS from the University of California, Berkeley. Fresh out of college, he worked at Hewlett-Packard for a few years before deciding he wanted to focus on auto racing.

Until 2007, he competed full-time in the NASCAR Craftsman Truck Series, being at the time the only African-American competing full-time in a NASCAR circuit. He also participated in a number of Sprint Cup races.