 In 2006, Wasserman Media Group acquired his NBA and MLB player representation practices.Tellem became the President of WMG Management as part of the deal.He brought along a client base of about 50 NBA and 50 MLB clients, including Tracy McGrady, Jermaine O'Neal, Pau Gasol, Jason Giambi, Hideki Matsui, Nomar Garciaparra and Mike Mussina.