Hathaway attended Acton-Boxborough Regional High School in Acton, Massachusetts, and Franklin Pierce University. In 2011, he briefly played collegiate summer baseball in the Cape Cod Baseball League for the Yarmouth-Dennis Red Sox. After his junior year at Franklin Pierce, the Diamondbacks selected Hathaway in the 14th round of the 2013 MLB draft.
The Diamondbacks promoted Hathaway to the Major Leagues on July 30, 2016. He posted a 4.91 ERA in 14.2 innings over 24 games for the Diamondbacks in 2016. He was outrighted to AAA on October 16, 2017, and released by the organization on March 14, 2019.
As of 2020[update], Hathaway had the most career Major League pitching appearances without a game started or a game finished.

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