[3] He then played college football for the USC Trojans, where he was part of the 1976 Trojan team and the 1978 Trojan team that both earned a share from some national selectors as the National Champion under head coach John Robinson.

He was future Houston Oilers Head Coach Jeff Fisher's roommate at USC.

Hartwig was an 8th round pick (214th overall) by the Houston Oilers in the 1979 NFL draft.

Hartwig ran a business in Arizona and has since retired.

This biographical article relating to an American football defensive back born in the 1950s is a stub.