McKnight is specialized in driving stunts and was a member of Bill Young's Precision Driving Team. Among his stunt resume are the films Speed (1994, with Alan Ruck, Richard Lineback, Carlos Carrasco, Jordan Lund, Patrick Fischler, Bruce Wright, Robin McKee, and stunts by Scott Wilder, Eddie Yansick, Janet Brady, Jophery C. Brown, Gary Epper, Tommy J. Huff, Eddie Matthews, Patricia Tallman, Chuck Hicks, and Jimmy Ortega) and Gone in Sixty Seconds (2000, with Michael Owen, Scott Burkholder, Tim de Zarn, Ken Jenkins, and stunts by Steve Blalock, Janet Brady, Jennifer Caputo, Eugene Collier, Eddy Donno, Kenny Endoso, Andy Gill, Jim Halty, Freddie Hice, Kane Hodder, Tommy J. Huff, Jeff Imada, Joel Kramer, Johnny Martin, Rusty McClennon, John Meier, Alan Oliney, Manny Perry, Denney Pierce, and M