Conversation so far:
What was American football coach Jimmy Johnson's first coaching job?
Johnson began as an assistant coach at Louisiana Tech University in 1965.
Was American football coach Jimmy Johnson successful at the position of assistant coach at Louisiana Tech University?
Jimmy helped recruit high school quarterback Terry Bradshaw from nearby Shreveport, Louisiana.
Did American football coach Jimmy Johnson set any records with the team at Louisiana Tech University?
Did American football coach Jimmy Johnson coach anywhere besides Miami and Pittsburgh ?
In 1979, Jimmy Johnson got his first head coaching job, at Oklahoma State University.
What was American football coach Jimmy Johnson's final coaching job in the early years?
Johnson became assistant head coach and defensive coordinator at the University of Pittsburgh under Jackie Sherrill in 1977 and 1978.

Question: When did he leave Miami?
Self-contained rewrite: When did American football coach Jimmy Johnson leave Miami?