[8] Theys' first appearance at Le Mans was in 1982, while his last start in the world's most famous endurance sports car race came 20 years later in 2002.

Theys competed in the CART Indy Car Series from 1987 to 1993 with 47 career starts,[9] including the Indianapolis 500 three times (1989, 1990 and 1993).

Theys' 1998 victories at Daytona and Sebring came in the Kevin Doran-prepared MOMO Ferrari with co-drivers Mauro Baldi, Arie Luyendyk and Giampiero Moretti.

[11] His 2002 Daytona victory came in the Doran Lista Dallara Judd with co-drivers Baldi, Fredy Lienhard and Max Papis.

Theys also drove a Maserati MC 12 for Doran Racing in the ALMS in 2007, an effort that stunned the GT1 class when it beat the factory Corvettes to win the pole at the Petit Le Mans that year.

He is also the Driving Director of DrivingXllence Archived 20 August 2012 at the Wayback Machine, an automotive event company that allows guests to experience the exhilaration and adrenaline of being behind the wheel of the world's newest and best Supercars.