Reiner had built comedy cred as an actor on “All in the Family” (1971-79) and as director and star of the mockumentary “This Is Spinal Tap” (1984). “When Harry Met Sally,” the classic rom-com he helmed, would premiere just weeks after “Seinfeld” debuted as “The Seinfeld Chronicles” in July 1989.

Jerry Seinfeld says the late Rob Reiner saved his NBC show, Seinfeld, from getting canceled.