List of Famous people with last name Hennessy

Jillian Noel Hennessy is a Canadian actress and musician. She is most known for her roles on the American television series Law & Order, on which she played prosecutor Claire Kincaid for three seasons, and Crossing Jordan, on which she played the lead character, Jordan Cavanaugh, for six seasons. She has also acted in films such as RoboCop 3 and Most Wanted, and the independent films Chutney Popcorn and The Acting Class, the latter of which she also wrote and co-directed.

John Leroy Hennessy is an American computer scientist, academician, businessman, and Chairman of Alphabet Inc. Hennessy is one of the founders of MIPS Computer Systems Inc. as well as Atheros and served as the tenth President of Stanford University. Hennessy announced that he would step down in the summer of 2016. He was succeeded as President by Marc Tessier-Lavigne. Marc Andreessen called him "the godfather of Silicon Valley."

Brisa Hennessy is a Costa Rican professional surfer who competes in the World Surf League.