Private equity firms MASTRY Ventures and General Catalyst completed the acquisition of a majority stake in Athletes First, a football agency. Financial terms were not disclosed. "Athletes First is not simply the name of our company, it is our culture, mission, and family. MASTRY Ventures and General Catalyst are exceptional partners for us as their success is rooted in that same philosophy. This partnership will redefine the traditional continuum of representation services as we use our combined platforms and vision to help clients maximize their positive impact on families, communities, and the world," Brian Murphy, Athletes First Founder and CEO.