He has worked in the front office of the Houston Rockets of the NBA and the Philadelphia Eagles of the NFL, Toronto FC, Real Salt Lake, and the Tampa Bay Mutiny in Major League Soccer and the Toronto Argonauts of the Canadian Football League.

[1] After high school, he was recruited by Adelphi, Hofstra, Harwick, North Carolina, but ultimately decided to attend the University of Bridgeport in Connecticut, who offered him a full-ride scholarship.

[4] In 1993, Manning began his career in sports management, joining the Continental Indoor Soccer League in a front office role for their inaugural season.

[6] In 2000, he joined Major League Soccer club Tampa Bay Mutiny as president and General Manager.

[9] After his contract with MLS expired in 2003, he moved to the National Basketball Association, joining the Houston Rockets as Director of Corporate Partnerships[12] In 2004, he moved to the National Football League with the Philadelphia Eagles serving as Vice President of Sales and Service, overseeing a 50% increase in corporate sponsorship from 2004 to 2007.

In 2009, RSL won the MLS Cup, which was the first major professional sports championship in Utah in 40 years,[6] and finished as runner-ups in 2013.

[19] In July 2024, he parted ways with Maple Leafs Sports and Entertainment, departing both roles by mutual agreement.