 During his tenure he won 51 Sports Emmys and 8 Peabody Awards.He succeeded Seth Abraham as president.HBO Sports is famous for its series "Sports of the 20th Century" a series of sports documentaries produced by Greenburg, as well as the leading sports magazine show "Real Sports with Bryant Gumbel", a football studio show led by Bob Costas, Dan Marino, Cris Carter, and Cris Collinsworth titled "Inside the NFL" and "HBO World Championship Boxing".