Birth Name: Mark David McGwire
Place of Birth: Pomona, California
Date of Birth: October 1, 1963
Ethnicity: German, Irish possibly other
Family Background: Mark McGwire is an American former professional baseball player.
Mark is the son of John McGwire and Ginger Huseman.
His paternal grandparents were Alexander Thomas McGwire (the son of John and Ellis McGwire) and Madelyn Marie Lynch.
His maternal grandparents were Paul Huseman and Alice Francis Rupprecht.
Source: Geni.com