In the late sixties Rob Reiner and Larry Bishop spearheaded an improv group in Los Angeles called The Session, which included Richard Dreyfuss and others. Reiner and Bishop formed a duo out of that group and went on tour. Here they are doing press for a show at The Hungry i, courtesy of the San Francisco Bay Area Television Archive. Within a year, Reiner would find himself onstage at The Committee. Reiner provided more background about this time in his 2011 interview with A.V. Club which you can find here.