Martin H. Peretz (; born December 6, 1938) is a former American magazine publisher and educator. Formerly an assistant professor at Harvard University, he purchased "The New Republic" in 1974 and assumed editorial control shortly afterwards. He founded the financial news website TheStreet.com in 1996 with personality and hedge fund manager Jim Cramer. Peretz is known for his strong support of Israel as well as his approval of the US invasion of Iraq in 2003. He retained majority ownership of "The New Republic" until 2002, when he sold a two-thirds stake in the magazine to two financiers. Peretz sold the remainder of his ownership rights in 2007 to CanWest Global Communications, though he retained his position as editor-in-chief. In March 2009, Peretz repurchased the magazine with a group of investors led by ex-Lazard executive Laurence Grafstein. In late 2010, Peretz gave up his title of editor-in-chief at "The New Republic", becoming instead editor emeritus, and terminated his blog "The Spine", after other editors and writers at the magazine said they found it offensive and that Peretz would not have had the opportunity to write it if not for the fact that he had been owner of the magazine. He no longer has any association with the magazine.