A standout for Coach Mike Sorrells' Dallas Highland Park High School, Shaun won Olympic gold medals at the 1988 and 1992 Summer Olympics. He also won a gold and silver at the 1991 Pan Pacific Swimming Championships. He was an NCAA champion in the 50-yard freestyle (1991) and 100-yard freestyle (1989 and 1991), and a 50-yard, 100-yard, and 200-yard freestyle SWC record holder. Captain of the 1990-91 NCAA Championship team, Shaun won four consecutive NCAA Team Championships with the University of Texas at Austin (1988-1991). He graduated from UT with a degree in economics in 1991 and an MBA in 1997 with a focus on marketing.