Trevor Booker is trying to build an empire. A lot of NBA players have side hustles or endorsement deals that supplement their league income. But the Sixers reserve forward isn’t just dabbling in small side ventures or planning for a stable life after basketball. Booker is a serial entrepreneur who with his college roommate, Jonah Baize, owns more than 12 companies, has shared interest in a half-dozen more, and is constantly looking to expand the portfolio. From a venture capital firm, to accredited private high schools and basketball academies, to real estate investments, and promising start-ups, Booker and Baize have no intention of slowing down. The goal is plain and simple: Booker wants to be a billionaire.