Posey played for the Homestead Grays and then later both managed and owned the famed club. A sharp, organized businessman, he helped turn the Grays into a perennial Negro League powerhouse, in terms of winning and profit. More than 10 of Posey’s Homesteaders went on to become Negro League Hall-of-Famers. The Grays, under Posey’s direction, split their home games between Pittsburgh (Forbes Field) and Washington, D.C. (Griffeth Stadium), routinely drawing up to 30,000 fans at each venue.