- Served in the Navy after high school and was assistant athletic director at his alma mater, Northwestern University.
- Was press secretary for cousin Adlai Stevenson's Presidential bids in 1952 and '56.
- Decided to pursuing acting after attending one of his cousin's parties in New York where he met numerous theater people.
- Acting debut was in the title role of The Music Man in summer stock.
- Established himself as a comedy writer on That Was the Week That Was and occasionally appeared in sketches with Alan Alda.
- Wrote for The Smothers Brothers Comedy Hour before landing a lead role on The Doris Day Show in 1969 as her boss.
- Big break came when cast as Lt. Col. Henry Blake on M*A*S*H.
- Guest hosted The Tonight Show for Johnny Carson 58 times.
- Headlined several series, including In the Beginning, The McLean Stevenson Show and Hello, Larry, but all were short lived.
- In 1985, co-founded and served as national spokesman for the Children's Burn Foundation, having been burned as a child by a Halloween pumpkin.
- 1974, Emmy — Best Writing in Comedy: Nominee
- 1974, Golden Globe — Best Performance by an Actor in a Supporting Role in a Series, Miniseries or Motion Picture Made for Television: Winner
- 1975, Emmy — Outstanding Continuing Performance by a Supporting Actor in a Comedy Series: Nominee
- 1973, Emmy — Outstanding Performance by an Actor in a Supporting Role in Comedy: Nominee
- 1974, Emmy — Best Supporting Actor in Comedy: Nominee
- Jeffrey MacGregor — Son
- Lindsey Stevenson — Daughter
- Adlai Stevenson III — Cousin
- Lottie Stevenson — Mother
- Edgar McLean Stevenson — Father
- Ann Whitney — Sister
- Ginny Fosdick — Wife
- Carrie Williamson — Ex-wife
- Northwestern University, Evanston, Illinois, United States (1952); attended American Musical and Dramatic Academy, New York, New York, United States
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