Though best known as one of the Emmy winning writer/producers of Lost (Outstanding Drama Series, 2005) and The Dark Crystal (Outstanding Children's Program, 2020), and for creating The Middleman graphic novel and TV series, Javier "Javi" Grillo-Marxuach is a prolific of TV, movies, comic books, essays, podcasts, and transmedia content.

Javi's current work includes writing and producing for Raising Dion (Nextflix), Blood & Treasure (CBS) and an upcoming event series for Epix.

An advocate of mentorship and diversity, Javi instituted the Grillo-Marxuach Family Fellowships for writers at USC film school, and the Carnegie Mellon University undergraduate Creative Writing Program. He also co hosts the Children of Tendu podcast, which educates new writers on navigating the business with decency and integrity, and mentors new writers as part of his work with the Writers Guild of America.

Javi was born in San Juan, Puerto Rico. His name is pronounced "HA- VEE-AIR GREE-JOE MARKS-WATCH."