Starting his career in sports cars toward the end of the 1970s, Adam drove as a privateer, winning a Canadian championship before being hired professionally.
Invited to join the factory backed Group 44 race team in 1980, he spent time co-driving with Bob Tullius in the Triumph TR8 in the IMSA series and had GTO class victories at the 12 Hours of Sebring, Road Atlanta, Mosport, and Road America, as well as a victory at Daytona where he drove alone.
In 1985, Adam joined Conte Racing, co driving with John Paul Jr. in the factory-backed March GTP racer.
Along with co-drivers including John Paul Jr., Juan Manuel Fangio II, Brian Redman, and Thierry Boutsen, he had a second-place finish at the Sebring 12 Hour with Hans-Joachim Stuck in 1995 and second place at Watkins Glen International.
In 2002, Adam drove two races of the Porsche Supercup at the Indianapolis Motor Speedway on United States Grand Prix weekend, placing 11th and 13th.