Jonathan Leff is a Managing Director at Warburg Pincus LLC, a private equity firm managing approximately $10 billion in private equity assets. He joined the firm in 1996. He is responsible for the firm's investment activities in biotechnology, pharmaceuticals and related industries. He received an AB in Government from Harvard College and a MBA from the Stanford University Graduate School of Business. Prior to joining Warburg Pincus, he was a consultant at Oliver, Wyman & Co. He is a director of Alita Pharmaceuticals, Allos Therapeutics, Altus Pharmaceuticals, InterMune, Inspire Pharmaceuticals, Neurogen Corporation, Sunesis Pharmaceuticals, and ZymoGenetics.