Peter Thacher Grauer (born October 1945) is an American businessman and entrepreneur. He has been a member of the Bloomberg L.P. board since October 1996 and was named chairman of the board in March 2001 succeeding Michael Bloomberg. Grauer joined Bloomberg full-time in his executive capacities in March 2002. Prior to becoming a member of Bloomberg L.P. in 1996, Grauer was the founder of DLJ Merchant Banking Partners and Investment. He also currently serves as the lead independent director of DaVita Inc.