He attended Hunter College in his native New York City.
He designed his signature guitar, the Elitist Nick Valensi Riviera P-94.
He was born to a Tunisian father and a French-American mother. He married photographer Amanda de Cadenet in 2006; that same year, the couple welcomed twins Ella and Silvan.
He learned a great deal about music from his Strokes bandmate Julian Casablancas.