Conversation so far:
Did anything happen significant in the 1979 NFL season for Dan Dierdorf?
On September 9, 1979, Dan Dierforf sustained torn ligaments in his left knee in the second quarter of the second game of the season against the New York Giants.

Question: Who did he play for during these seasons?
Self-contained rewrite: Who did Dan Dierdorf play for during the 1979 to 1983 NFL seasons?