Susan Kay Quatro (born June 3, 1950) is an American rock singer-songwriter. Beginning in the 1970s, Quatro found greater career success in the United Kingdom than her native USA, and has resided in the UK for much of her life.
The first prominent female bass player in rock, Quatro parlayed her musical fame to an acting role in Happy Days, where she portrayed Leather Tuscadero, a bass player like herself.
Quatro married German concert promoter Rainer Haas in 1993. She splits her time between Essex, Hamburg, and her native Detroit.