Casady was born in Washington D.C., the son of Mary Virginia (née Quimby) and William Robert Casady. His father was of half Irish Protestant and half Polish Jewish ancestry. His mother was a relative of aviator Harriet Quimby; some of her family had been in North America since the 1600s.\n', '

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.\n', '

Casady 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. He replaced original Jefferson Airplane bassist Bob Harvey the following month.\n', '

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