William was born on August 26, 1921 in Columbia, PA. He obtained a Master's degree in English literature from Penn State. William Preston started an acting career late in his life, giving up his career as a book keeper in a Philadelphia trucking firm to begin acting at age 50. He had extensive stage experience, performing in over 60 Shakespeare ...
He appeared in more than sixty productions of Shakespeare plays and boasted that he had seen productions of Shakespeare's 37 plays, at least once.
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He became a full-time actor at age 50.
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Held a masters degree in English Literature from Penn State University.
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He has a twin brother, Robert J. Preston
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Portrayed recurring character Carl 'Oldy' Olson on Late Night with Conan O'Brien (1993), NBC. He made his last national TV appearance as the character one week prior to his death. "Late Night" did a touching video eulogy shortly after his death.
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Upon his death the Late Night with Conan O'Brien (1993) aired a short tribute to him comprising comedy bits from the show.