American-Canadian singer, songwriter, and composer (born July 22,1973). He has recorded seven albums of original music and numerous tracks on compilations and film soundtracks. He has also written a classical opera and set Shakespeare sonnets to music for a theater piece by Robert Wilson.

Born to folk music luminaries Loudon Wainwright III and Kate McGarrigle, his sister is singer-songwriter Martha Wainwright and his half-sister is singer-songwriter Lucy Wainwright Roche. He was raised in Canada, and has both US and Canadian citizenship. He fathered a daughter with Lorca Cohen named Viva Katherine Wainwright Cohen born February 2, 2011. Grandson of Loudon Wainwright II, and nephew of Teddy Wainwright, Sloan Wainwright and Anna McGarrigle.