For fourteen years he taught economics, finance, statistics, entrepreneurship, and forecasting as a tenured faculty member in the college of business at Rochester Institute of Technology.
[3] In 1979 Thomas Greco became a private consultant and community activist, working with local Rochester, New York peace and justice groups.
From 1981 to 1990 he served as trustee and then president of the School of Living which promotes "self-governing communities that are democratic, humane, globally conscious and ecologically sound".
[3] From 1989 to 1991 he co-edited Green Revolution, a journal dedicated to right education, right living and personal responsibility.
After moving to Arizona, Greco assisted in the development of LETSonora (a Local Exchange Trading System) and helped organize Tucson Traders, both now defunct, and in 1991 organized the Community Information Resource Center (CIRC) as a project of NEST, Inc., which promoted transformative approaches to community building.