Trivia

When her acting career diminished, Miss Yarnall began to work in real estate. Despite warnings about limited opportunities for success, she earned a six-figure income in her first year with a real estate firm. By 1982, she owned Celeste Yarnall & Associates, which a syndicated columnist described as "one of L.A.'s top office real estate firms".

In 1988, Miss Yarnall achieved a doctorate in nutrition, following she was a nutrition lecturer at Pacific Western University. She also became a breeder of Tonkinese cats and wrote two books: "Nautral Dog Care: A Complete Guide to Holistic Care for Dogs" and "Natural Cat Care: A Complete Guide to Holistic Care for Cats".

In 1964, at age 19, Miss Yarnall was voted "Miss Rheingold", the winner of an annual beauty contest voted on by buyers of New York-based Rheingold beer. She was the last elected winner of a contest that had been run since 1942, and represented Rheingold at its pavilion at the 1964 World's Fair.

Best remembered by the public (and by many sci-fi fans) for her role as Yeoman Martha Landon in the Star Trek (1966) second season episode The Apple (1967).

Attended and graduated from John Marshall High School in Los Angeles, California.

She had one daughter: Camilla Yarnall (born 1970).

Following her death, she was interred at Forest Lawn Memorial Park in Glendale, California, at the Gardens of Contemplation.