Diaz was born and raised in Manhattan, New York City, and is of Puerto Rican descent. He attended Professional Performing Arts High School for one semester before transferring to Dwight Global Online.
In 2015, Diaz was cast as Obnoxious Kid #1 in Carrie Pilby. In 2016, Diaz joined the revival and first all-kid professional cast of You're a Good Man, Charlie Brown as Schroeder at the York Theater. Diaz went on to join the closing cast Broadway production of Matilda the Musical as a Bruce swing. Early in 2017, Diaz was cast as Tommy in the last U.S. tour production of Matilda the Musical.
Diaz played the role of boy in January 2018 in the production of Zurich at NYTW, and earned a nomination for Outstanding ensemble at the New York Innovative Theatre Awards - Home. In March 2018, Diaz appeared in the Netflix series Unbreakable Kimmy Schmidt as Quentin. Diaz was cast as lead role Pedro in May 2018 in the production of Pedro Pan at the Acorn theatre. He won a NYMF Performance award.

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