He is best known for his successful pinball designs from 1982 - 1996 .
Mark Ritchie ( born August 20 , 1958 ) is an American pinball designer and video game producer .
Mark Ritchie is best known for Mark Ritchie 's successful pinball designs from 1982 - 1996 .
Mark Ritchie ( born August 20 , 1958 ) is an American pinball designer and video game producer .