Before entering politics, Keegan was a self-employed real estate agent and licensed valuer.
[1] Keegan sought and won by a 5.3-point margin the extremely safe Labor party seat of Newcastle at the 1988 New South Wales state election which saw the landslide defeat of the Barrie Unsworth Labor Government which had collectively been in power for well over a decade.
He sought re-election at the 1991 New South Wales state election however was defeated by the new Labor candidate.
Keegan had two sons from his first marriage to Laurel Woollett, and at the time of his death was married to Jeanette Ballard and also had two stepdaughters.
Keegan died on 25 November 2008 in the Newcastle suburb of Gateshead, New South Wales after a severe Heart Attack the week before.