He is the author of two books, Steak and The Dorito Effect, and his writing has appeared in publications that include The New York Times, The Wall Street Journal, Men’s Journal and Best American Travel Writing. Mark is also a field reporter for The Dr. Oz Show and is a radio columnist with the Canadian Broadcasting Corporation. On “The Dr. Oz Show,” Mark contributes to the Food Truth series, reporting on trends, issues and scandals in the food business, and making the science of nutrition relevant and understandable to an audience of more than a million viewers.