Well, not his entire career. He pitched for Toronto on Opening Day 1977, you say you were there.....April 7, 1977 was a damp winter day but I was elated to be there. Bill Singer, I believe he had pitched his entire career for the Dodgers. Not going to Google it.
He also pitched for the Angels, Rangers & Twins.
I did not attend the game on 4/7/77, but did see the 1st of many live, on the Sunday following.