Through the success of his bakery–which in 2016 was earning $12 million in revenues–Glassman founded the Greyston Foundation (sometimes called Greyston Mandala) with his wife Sandra Jishu Holmes in 1989. He retired from the Greyston Foundation in 1996 to pursue socially engaged Buddhist projects through the Zen Peacemakers. As of 2004 the Foundation had developed $35 million worth in real estate development projects in Westchester County, New York. The Foundation offers HIV/AIDS programs, provides job training and housing, child care services, educational opportunities, and other endeavors. In 2003 the bakery moved to a new building, which allows for higher output and more employment opportunities.