Kiefel is a seven-time Tour de France racer, Olympic bronze medalist and member of the United States Bicycling Hall of Fame.

Kiefel rode for American professional teams such as 7-Eleven, Motorola, Coors Light and Saturn.

[2] He competed in seven Tours de France, and represented the USA at the 1984 Olympic Games, where he won bronze in the team time trial with Roy Knickman, Davis Phinney, and Andy Weaver.

He retired from racing in 1996 and has since commentated on TV and radio for European classics and tours.

In 2004, Kiefel was inducted in the United States Bicycling Hall of Fame.