• 1989
Memoirs of a Counter-Revolutionary (Ghostwriter for Arturo Cruz), Doubleday, • 1992 ''Stephen Hawking's A Brief History of Time: A Reader’s Companion'' (in collaboration with Stephen Hawking), Bantam, • 1994
Little Girl Fly Away, Simon & Schuster, • 1997 ''Dr Fulford's Touch of Life'' (co-writer with osteopath Robert C. Fulford), Gallery, • 1998
The Halo Effect: How Volunteering Can Lead to a More Fulfilling Life and a Better Career (co-written with Outward Bound CEO John Reynolds), Golden Books Adult Publishing, • 2000
Play Like a Man, Win Like a Woman (Ghostwriter with CNN executive VP Gail Evans), Broadway, • 2002
Kindred Spirits: How the Remarkable Bond Between Humans and Animals Can Change the Way we Live, (Ghostwriter for veterinarian Allen Shoen), Broadway, • 2002
Love is the Killer App (Ghostwriter for Yahoo! Chief Solutions Officer Tim Sanders), Crown Business, • 2003
UltraPrevention (Ghostwriter for Mark Hyman and Mark Liponis- Medical Directors of Canyon Ranch), Scribners, • 2004
The Bush Survival Bible, Villard, • 2006
The Watch – First Edition, Harry N. Abrams, • 2007
Ultralongevity: The Seven Step Program for a Younger, Healthier You (co-writer with Canyon Ranch Medical Director Mark Liponis), Little, Brown and Company, • 2007
Duck! The Dick Cheney Survival Bible, Villard, • 2008
Saving the World at Work (Ghostwriter for Yahoo! CSO Tim Sanders), Crown Business, • 2009
The Engine 2 Diet (written with Rip Esselstyn), Grand Central, • 2010
The Secrets of People Who Never Get Sick, Workman, • 2011
Start Something That Matters (Ghostwriter for TOMS Shoes founder Blake Mycoskie), Random House, • 2011
Forks Over Knives: The Plant-Based Way to Health (Editor), The Experiment • 2013
Finding the Next Steve Jobs (Co-author with Atari and Chuck E. Cheese Founder Nolan Bushnell), Simon & Schuster, • 2013
My Beef With Meat (Ghostwriter for Rip Esselstyn), Grand Central, • 2014
The Awareness (co-written with Jon Doyle), Stone, • 2015
How Not to Die (co-written with
Michael Greger) Flatiron, • 2015
Living the Farm Sanctuary Life (co-written with
Farm Sanctuary founder Gene Baur) Rodale, • 2017
The Trump Survival Guide Dey Street, • 2017
Mercy for Animals (co-writer with
Mercy for Animals founder Nathan Runkle), Avery, • 2017
The How Not do Die Cookbook (Co-writer with Michael Greger, M.D.), Flatiron, • 2017
Mercy for Animals (Co-writer with Mercy for Animals founder Nathan Runkle), Avery, • 2017
Mercy for Animals (Co-writer with Mercy for Animals founder Nathan Runkle), Avery, • 2017
The How Not To Die Cookbook (Co-writer with Dr. Michael Greger) Flatiron, • 2018
Eat for the Planet (co-writer with OneGreenPlanet.org founder Nil Zacharias), Abrams • 2018
The Watch, Thoroughly Revised (co-writer with Stephen Pulvirent), Abrams, • 2018
Eat for the Planet (With OneGreenPlanet.org founder Nil Zacharias), Abrams, • 2019
Rescue Dogs (Co-writer with undercover animal abuse investigator “Pete Paxton”), Penguin Books, • 2020
Animalkind (With PETA co-founder Ingrid Newkirk) Simon and Schuster, • 2020
Eat for the Planet Cookbook (with OneGreenPlanet founder Nil Zacharias), Abrams, • 2020
Healthy at Last (Ghostwriter for New York City Mayor Eric Adams), Hay House, • 2021
72 Reasons to Be Vegan (With bestselling Veganist author Kathy Freston), Workman, • 2025
Wild on Purpose (Ghostwriter for American Prairie Founder Sean Gerrity), Torrey House, • 2025
Vegana Italiana (Co-writer for Pura Vita Restaurant chef/owner Tara Punzone), Rodale, ==References==