Lotman was the son of a butcher, and established Keystone Foods which was instrumental in developing the use of mass produced frozen burgers, and supplied these as well as chicken and fish products to McDonald's.
Lotman was the son of a butcher, and began his working career in his family's beef wholesale business. He established Keystone Foods which was instrumental in developing the use of mass produced frozen burgers in the late 1960s, and supplied these as well as chicken and fish products to McDonald's.