He has done uncredited work on the scripts for The Score (2001), Frida (2002), and The Incredible Hulk (2008).
Alongside his work in cinema, Norton is an environmental and social activist, and is a member of the board of trustees of Enterprise Community Partners, a non-profit organization for developing affordable housing founded by his grandfather James Rouse.
His maternal grandfather, James Rouse, was the founder of The Rouse Company, who developed the city of Columbia, Maryland (where Norton grew up), helped develop Baltimore's Inner Harbor, Norfolk's Waterside Festival Marketplace and Boston's Quincy Market, as well as co-founded Enterprise Community Partners with Norton's maternal step-grandmother, Patty Rouse.
Norton is president of the American branch of the Maasai Wilderness Conservation Trust.
In July 2010, Norton was designated as the United Nations Goodwill Ambassador for Biodiversity by UN Secretary-General Ban Ki-moon.