After founding the program, Marshall consulted CNN Chairman Tom Johnson on the creation of a youth-based global news network.
GNN also hosts blogs and discussion forums for registered users and produces feature documentaries, books and music videos.
His final documentary feature with revolutiontheory, Holy Wars was edited by Dan Swietlik (An Inconvenient Truth, Sicko), produced with Smuggler and completed in 2010.
Variety's Justin Chang wrote, "Marshall's cool, agnostic approach effectively modulates the intense battle of wills that develops between the uniquely compelling subjects."
Marshall's first book, True Lies, was published in October 2004 by Penguin/Plume and is a collaboration with GNN co-founders Anthony Lappe and Ian Inaba.