William D. Caballero is a Los Angeles-based filmmaker, writer, Guggenheim Fellow, and Creative Capital Awardee. Born in Coney Island, New York and raised in North Carolina, Caballero obtained the Bill Gates Millennium Scholarship in 2001, and returned to New York City where he graduated from Pratt Institute (BFA Digital Art, 2006, Minor in Art History ) and New York University (MA The Arts and Humanities in Education, 2008), graduating Magna Cum Laude and Cum Laude, respectively.

Caballero's directorial debut came in the form of a feature length autobiographical documentary entitled AMERICAN DREAMS DEFERRED, which focused on the diverse health, financial, and social difficulties facing his Puerto Rican-American family. This cinema-verité film was selected for the NALIP (National Association of Latino Independent Producers) Latino Producers Academy, eventually receiving the first annual HBO-NALIP Documentary grant. Five years after its conception, it went on to have a national television premiere on PBS on December, 2012. Post-premiere, he has screened the documentary at over 40 American universities.

In 2012, he completed SEED STORY, a macro short film featuring a cast of hundreds of one-inch tall plastic hand-painted figures, which debuted the following year at the Slamdance Film Festival, and later became a Vimeo Staff Pick. In 2013, Caballero was selected for the Aljira Emerge program (in partnership with Creative Capital), a strategic career management and exhibition platform for emerging artists. Later that year, he gave two keynote speeches at the annual Bill Gates Leadership Conferences in Washington, DC and San Jose, CA as an ‘alumni guest-of-honor.'

Caballero’s next accomplishment was GRAN’AP KNOWS BEST, a web-series featuring 3D printed miniatures of his Puerto Rican Grandfather. The series was later licensed by HBO for two seasons, and culminated in a short film entitled VICTOR AND ISOLINA, which premiered at the 2017 Sundance Film Festival.

In January 2017, Caballero released STORYBORED USA, a web-series aimed at empowering diverse young people to tell their stories through creative arts and media. The show features 3D printed miniatures of Caballero as the show's host, and was funded by Latino Public Broadcasting. Also in November 2017, Caballero was chosen as one of ten filmmakers for the SUNDANCE NEW VOICES LAB, held in Los Angeles, California.

From 2020 -2021, Caballero received funding from Latino Public Broadcasting to create CHILLY AND MILLY, an animated short film about his Puerto Rican parents, that will premiere at the 2022 Sundance Film Festival. In addition, Black Public Media funded Caballero to create an animated series about black barbershop culture. He also received a production grant from BRIC TV to create an animated, political satire web-series, entitled THE UNITED SPACE OF AMERICA, which debuted on YouTube in November, 2021. Lastly, from August 2021 until December 2021, Caballero was currently an artist in residence at the McColl Center in Charlotte, North Carolina.

Heading into 2022, Caballero is a recipient of the LALIFF Inclusion Fellowship, in which he was provided 20K to create a short film narrative project, due to be finished by Summer, 2022.