The Archive of American Television conducted an interview in 1999 with Mary Kay and Johnny Stearns–the creators, writers, and stars of the first US network-TV sitcom, Mary Kay and Johnny. The 15-minute weekly show debuted on November 18, 1947.
The interview is described here:
http://www.emmytvlegends.org/interviews/people/johnny-stearns
And the first video in the series is on YouTube here: