Wagner's U.S. athletes, according to the USATF site:
He also represents Christopher Belcher, the North Carolina A&T Athlete who seemingly went pro between the semis and final at USA's.
Belcher's college coaches: Balco athletes Garfield Ellenwood and Duane Ross.
This explain a bit more about the connection of Wagner to Nehemiah (May, 2010):
"OCTAGON SIGNS WAGNER: Octagon has added European track agent and event organizer ROBERT WAGNER to its Olympics & Action Sports division. Wagner represents 32 clients, including American LOLO JONES, Great Britain's DAVID GREENE and Slovenia's MARIJA SESTAK. He also worked on several international events like the European championships. He will remain in Europe and work closely with Octagon Dir Of Track & Field RENALDO NEHEMIAH. Wagner will work in Octagon's Monaco office. Nehemiah said, "I didn't have a global partner to truly feel that we were a global entity. With USAIN BOLT mania, we think we can leverage the addition of Robert Wagner. Having someone who is well known throughout the world and has a lot of experience really shores up our abilities on all fronts""