Mortensen is the founder of Ghost Robot, a production and management company in New York City. Recent productions include "Against The Current" staring Joseph Fiennes, Michelle Trachtenberg and Mary Tyler Moore, the Gotham Award winning feature film "Choking Man" by iconoclastic music video director Steve Barron as well as "Dr. Bronner's Magic Soapbox" the critically acclaimed documentary by director Sara Lamm.  In spring 2008 Ghost Robot produced the awe-inspiring 3D music video for Bjork's "Wanderlust."

Mortensen's feature "Road" by director Leslie McCleave premiered at the Los Angeles Film Festival 2005 where it was awarded outstanding performance for the two leads, Catherine Kellner and Ebon Moss-Bachrach and followed its theatrical release with a run on Showtime. Mortensen previously produced the award winning documentary features "Breath Control: The History of the Human Beat Box" and "Hell House" by George Ratliff.

Together with Joshua Zeman, Mortensen is developing "KINGSTON" with writer/director Richard Regen and "Welcome to Forest Grove" the first narrative feature by acclaimed director Jonathan Caouette.