Harvey Guillén is an Mexican-American actor who is best known for his role as the human familiar Guillermo de la Cruz in the 2019 television series "What We Do in the Shadows." Guillén has appeared in recurring roles on a number of television series, such as Alistair Delgado on "Huge" (2010), Cousin Blobbin on.

Guillermo's hairstyle in "What We Do in the Shadows" is based on the hairstyle Harvey created for his audition for the show.

Harvey is multilingual, being naturally fluent in English and Spanish, but he also became fluent in Japanese after spending thirteen months in Japan.