Warren Frost (June 5, 1925 – February 17, 2017) was an American actor. His work was mainly in theater, but he worked in films and television sporadically from 1958. He is known for television roles on Matlock and Seinfeld, and particularly as Doctor Hayward on Twin Peaks, a series co-created by his son Mark Frost. He has also appeared in television movies, such as Psycho IV: The Beginning (1990) and The Stand (1994). Description above from the Wikipedia article Warren Frost, licensed under CC-BY-SA, full list of contributors on Wikipedia.

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Warren Frost was an American character actor and veteran best known for his prominent television work in Twin Peaks and Seinfeld.
He is primarily known for portraying Dr. Will Hayward in Twin Peaks and Mr. Ross in Seinfeld.
He appeared in notable television series including Twin Peaks, Seinfeld, and Matlock. Full filmography on Mood.