According to Yahoo are
1.
Al Haymon "advisor" but he's really a promoter/manager who guides the careers of alot of boxers including Floyd Mayweather Jr
2.
Todd deBouf President of Top Rank promotions
3.
Richard Schaefer CEO of Golden Boy Promotions
4.
Curtis Jackson aka 50 Cent Founder of TMT promotions
5.
Bob Arum Founder of Top Rank promotions
6.
Ken Hershman President of HBO sports
7.
Floyd Mayweather Jr P4P #1 boxer and the biggest draw in the sport
8.
Manny Pacquiao P4P #2 and the 2nd biggest draw in the sport
9.
Stephen Espinoza Executive Vice President of Showtime sports
10.
Kathy Duva Promoter of Main Events promotions
11.
Leonard Ellorbe CEO of Mayweather promotions and close friend of Floyd
12.
Fernando Beltran Mexican promoter who works with Top Rank
13.
Oscar De La Hoya Founder of Golden Boy Promotions and former boxing star
14.
Richard Plepler Co-president of HBO
15.
Keith Kizer Head of the Nevada commission
16.
Wladimir Klitschko The Heavyweight Champion of The World
17.
Jim Lampley HBO commentator
18.
Michael Koncz Manny Pacquiao's advisor and close friend
19.
Bruce Trampler Top Rank's matchmaker
20.
Bernd Boente Personal manager of The Klitschko brothers
21.
Eric Gomez Golden Boy's matchmaker
22.
Gordon Hall Runs Showtime's ShoBox series
23.
Cameron Dunkin Boxing manager who guides the careers of Bradley, Donaire etc
24.
Mark Taffet Senior Vice President of HBO's operations and PPV's
25.
Kerry Davis Senior Vice President of HBO Sports
http://sports.yahoo.com/news/boxing--the-25-most-powerful-people-in-boxing.html