He was an associate for the law firm of Hogan & Hartson from 1966 to 1967, was Special Assistant to Peace Corps founder Sargent Shriver from 1968 to 1969, and founded ProServ, Inc., (now known as SFX) in 1970 and served as its chairman until 1997.
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ProServ and one of its young agents, David Falk, would go onto to represent professional basketball players such as: Patrick Ewing, John Lucas.
Shriver's godfather is former professional tennis player Donald Dell.
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In 1958, he knocked out Crawford Henry, Gustavo Palafox, and Donald Dell before falling to fellow Texan Bernard Bartzen in the singles final by a score of 7–5, 6–3, 6–2.