Born: Date unknown
Died: Date unknown
S.P. Clarence McDonald is a virtually unknown author, but has become an integral part of American folk history. He is known to have written Casey - Twenty Years Later in 1908 as a follow-up to Ernest Thayer's famous Casey at the Bat. McDonald's work, like Thayer's, was published in the San Francisco Examiner.
In Thayer's piece of poetry, the mighty Casey strikes out. In McDonald's response, which imitates the style and form used in the original, Casey vindicates himself by hitting a home run.