Like most people in the publishing world, Marshall is a book junkie–an avid reader, a bookstore and library hound, a published writer, editor, and publisher. Unlike many bookish sorts, Marshall is also a focused businessperson. After graduating Phi Beta Kappa from Northwestern University, he had a very successful stint as a stockbroker (the savings and investments from that short period allowed him to subsidize more idealistic pursuits – see his New York Times Magazine column about that experience). Since then Marshall has been both a writer and small business owner. In 1990 he started the ad-based environmental quarterly Green Living and was the editor/publisher until selling it in November 2005. After selling Green Living, Marshall devoted himself full time to Echo Point Books & Media. Starting the business literally from his basement with one part-time employee, the business has grown 100-fold. It now employs about forty. In 2011, Echo Point added a publishing division; by the end of 2014 it had roughly 150 books in print.
Marshall has written two books, The Mindful Money Guide: Creating Harmony Between Your Values and Your Finances (Random House/Ballantine Wellspring, 1998) and Beyond the Breath: Extraordinary Mindfulness Through Whole-Body Vipassana Meditation (Tuttle Publishing, 2002), and he has published articles in many publications including The New York Times Magazine, The Chicago Tribune, San Francisco Examiner, The Washington Post, Mother Earth News, Natural Home, Tricycle: The Buddhist Review, Buddhadharma (a spinoff of Shambhala Sun), and E Magazine.