Millsport became the sports sponsorship and motorsports consulting and activation division of fellow Omnicom agency The Marketing Arm in 2004, a move that triggered several personnel moves within the agency.
On 28 July 2013, it was announced that Publicis Groupe and Omnicom Group would merge to form Publicis Omnicom Group.
Before selling a majority of HSV to Omnicom in 2000, Horrow served as a consultant to the NFL, NASCAR, PGA Tour, and Major League Soccer, among countless other professional sports franchises.
Harper is the son of painter and advertising agency chairman of Needham Harper Worldwide Paul Harper Jr., and has five siblings including actress Jessica Harper, composer William Harper, illustrator Lindsay Harper duPont, Rev. Charles Harper and Diana Harper.