Joshua has written projects for AltaVista [producers of Amores Perros], Giant Door Productions [Chapter 27], Fox Searchlight (through State Street Entertainment) [Barbershop, Men of Honor] and has another optioned by Nabushea Pictures [Sling Blade, Eternal Sunshine of the Spotless Mind]. In 2008, his screenplay Cabin Fever 2: Spring Fever completed production for Lionsgate and his fantasy adventure adaptation Kane picked up by Tonic Films. He is currently developing a project about the Israeli-Palestine conflict for Pines & Olives Productions, and is working on a new installment of the 80s cult franchise Beastmaster.

In October 2001, Joshua wrote and produced a feature length documentary on international puppetry, Worlds of Imagination. He had previously written and produced two other documentaries: Ink, about underground comics, and Puppets - The Power of Wonder, produced in association with Jim Henson Productions. The latter, created for an exhibit at Atlanta's Center for Puppetry Arts, opened during the Olympic Games and has since screened at New York's Public Theater.

Joshua received his master degree in Directing from the American Film Institute. His AFI short film Dust successfully made rounds on the festival circuit and, among its many honors, won a Student Emmy Award as well as Best Dramatic Short at the New York Independent Film Festival. He also has a BA (Summa Cum Laude) in visual arts with an emphasis on sculpture and videography from UC, San Diego. While there, Joshua created a dozen short films and videos and designed two well reviewed public installations, incorporating film, video, and painting.