What MASH principal won for acting and writing directing?

You're likely thinking of Alan Alda, who played Hawkeye Pierce on MASH. He won:

* Five Emmy Awards for Outstanding Writing in a Comedy Series for his work on MASH

* One Emmy Award for Outstanding Lead Actor in a Comedy Series for his performance as Hawkeye Pierce

* One Golden Globe Award for Best Actor - Television Series Musical or Comedy for his role in MASH

While Alan Alda won awards for writing, directing, and acting, he was never officially a *principal* on MASH. He was a writer, director, and actor, but not a producer or showrunner.