Michael A. Klaper is an American physician, vegan health educator, conference and event speaker, and an author. He has written countless books on nutrition, and has appeared in several films related to vegan diet and practice, including Eat This! (2005), Cowspiracy: The Sustainability Secret (2014), and What the Health (2017).

He has also been:

• A NASA nutrition adviser and on vegan diets for long term space colonists
• Inducted into the Vegetarian Hall of Fame of the North American Vegetarian Society
• In the advisory board, and regular contributor to the quarterly publication Naked Food Magazine