Mark Volman (born April 19, 1947) is an American rock and roll guitarist, vocalist, and songwriter, best known as a founding member of the Turtles. Volman became a stand-out figure upon joining Frank Zappa’s Mothers of Invention. At times during his career he has used the pseudonym "Flo" (abbreviation from "Phlorescent Leech"), working alongside his friend and partner Howard Kaylan; they at times have used the stage names of Flo & Eddie.