Sperry co-founded Westwood Studios with Louis Castle in 1985, when both were in their early 20s. Before starting Westwood Studios, Sperry worked at Applied Computer Technology in Las Vegas with Peter Filiberti doing game conversions for Activision, Imagic and others. One of his major works was the port of Impossible Mission to the Apple II.
In 1996, GameSpot named him as the third most influential person in the PC gaming of the year, as well as sixth of all time. In 1997, Computer Gaming World ranked him as number six on the list of the most influential people of all time in computer gaming for game design.