John William "Jack" Casady 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. 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, 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. 

April 13th, 1944 in Washington, D.C. (Age 80)