Ian Greengross is an experienced sports agent and advisor affiliated with GAME Sports (Game Sports & Entertainment), a sports representation and athlete management firm based in Chicago, Illinois. He has been certified by the National Football League Players Association (NFLPA) since 2003 and has worked in professional football representation for over two decades, focusing on contract negotiation, career advisory services, and athlete development. Greengross operates within the broader GAME Sports structure, where he has represented NFL players, coaches, and executives across football and hockey. His work includes contract negotiation, salary cap advisory, scouting input, and long-term career planning for clients navigating professional sports careers. Over the course of his career, he has been involved in representing NFL talent at multiple levels of the league, including draft prospects and active roster players. Public records show that he has worked with notable NFL clients in earlier phases of his career, including high-profile draft picks and veteran players, particularly during the mid-2000s era of his agency activity.