Javier "Harvey" Guillén is a 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 "The Thundermans" (2013-2018), George Reyes in "Eye Candy" (2015), and Benedict Pickwick on "The Magicians" (2017-2018). He also appeared in the 2013 film "The Internship."