As an Orthodox Jew, Schwartz began to explore what Judaism had to say about diet, ecology, and the proper treatment of animals.

Schwartz argues that the realities of animal-based diets and agriculture conflict with basic Jewish mandates to preserve human health, treat animals with compassion, protect the environment, conserve natural resources, help hungry people, and pursue peace.

Schwartz also spoke at the Summerfest on "Judaism and Vegetarianism" and "Ten Approaches to Obtain a Vegetarian-Conscious World by 2010."

Schwartz's writings inspired the 2007 documentary film, A Sacred Duty: Applying Jewish Values to Heal the World, directed by Lionel Friedberg.

He is a Modern Orthodox Jew and belongs to the Young Israel Congregation of Staten Island, New York.