John Phelan is an American businessman and investor, best known for his role in the leveraged buyout firm Blackstone Group. He joined Blackstone in 1989 and rose through the ranks to become a senior managing director, playing a significant role in many of the firm's high-profile deals. He eventually left Blackstone in 2014 to co-found MSD Partners, an investment firm backed by Michael Dell. Phelan is widely regarded as a shrewd and successful investor, with a long track record in private equity.
