Mark drafted all of the documentation for the original formation of the Center for Sacred Studies, and has assisted in the development of various other non-profit entities. Mark served as a member of the Board of Directors of CSS for three years, including two years as its President. He continues to provide pro bono legal representation to CSS on all matters. Mark is a member of the pro bono advocacy network of the Women’s Earth Alliance, and also provides pro bono legal services to various worthy causes.