Rob Corddry was born 4 february 1971 in Weymouth, Massachusetts. He is the son of Robin (née Sullivan) and Steven Corddry, who was a Massachusetts Port Authority official. He is the older brother of actor Nate Corddry. He also has a younger sister, Laura Corddry, who is an administrator at Southern New Hampshire University. Corddry and his brother are both Eagle Scouts from Troop 19, located in Weymouth. After graduating from Weymouth North High School (1989), Corddry went to the University of Massachusetts Amherst (1989–93). According to an interview in the UMass Amherst alumni magazine, Corddry initially planned to major in journalism; but he stuck with it for just two days. English became his official major; but, by his second year, he focused much of his attention on Drama classes and plays including Torch Song Trilogy, Ten Little Indians, Cat on a Hot Tin Roof, Romeo and Juliet, and Reckless. While at UMass, Corddry pledged the Theta Chapter of Theta Chi fraternity. In January 1994, Corddry moved to New York City. His early paying jobs included working as a security guard at The Metropolitan Museum of Art and handing out menus for a Mexican restaurant. He eventually landed acting jobs, including a year-long tour with the National Shakespeare Company. He trained in improv at the Upright Citizens Brigade Theatre in New York City, performing regularly as a member of the sketch comedy group "The Naked Babies" (with John Ross Bowie, Brian Huskey, and Seth Morris); and he spent two years with the sketch comedy group "Third Rail Comedy". Corddry's first notable television appearances were on Comedy Central's Upright Citizens Brigade (1998–2000). In Spring 2002, he was asked to audition for The Daily Show and was accepted. His pieces for The Daily Show frequently included references to Boston, Massachusetts, which he considers to be his hometown. On October 4, 2005, his younger brother Nate Corddry made his first appearance as a Daily Show correspondent.

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