He was born in New Rochelle, New York, in 1952, a son of illustrator and cartoonist John Cullen Murphy.

His family moved to Dublin, Ireland for several years, including 1966, the 50th anniversary of the Easter Revolution.

(2007), which compares the politics and culture of Ancient Rome with that of the contemporary United States;[4] God's Jury: The Inquisition and the Making of the Modern World (2012); and Cartoon County: My Father and His Friends in the Golden Age of Make-Believe (2017), a history of the cartoonists and illustrators from the Connecticut School.

He is on the advisory board of the literary magazine The Common, based at Amherst College.

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