Mark Volman (born April 19, 1947) is an American rock and roll guitarist, vocalist and songwriter, best known as a founding member of the 1960s band the Turtles. Volman became a stand-out figure upon joining the Mothers of Invention under the tutelage of Frank Zappa. At times during his career he has used the pseudonym "Flo", working alongside his friend and partner Howard Kaylan; they at times have used the stage names of Flo & Eddie.