John William "Jack" Casady (born April 13, 1944) is an American musician considered one of the foremost
bass guitarists of the rock music era and best known as a member of
Jefferson Airplane and
Hot Tuna. First playing as a lead guitarist with the
Washington D.C. area rhythm and blues band "The Triumphs", he switched to bass during his high school years and while still underage (and with a forged I.D.), played the Washington D.C club scene, backing artists such as
Little Anthony and the Imperials and
Ray Charles. He became the bass player for
Jefferson Airplane when lead guitarist
Jorma Kaukonen, a high school friend and former Triumphs rhythm guitarist, invited him to join in late September 1965. Jefferson Airplane became the first successful exponent of the
San Francisco Sound. Their singles, including "Somebody to Love" and "White Rabbit," had a more polished style and successfully charted in 1967 and 1968. Casady, along with the other members of Jefferson Airplane, was inducted into the
Rock and Roll Hall of Fame in 1996.