Martha K Field Martha K. Field is Professor of Economics at Greenfield Community College, where she has taught environmental economics for many years. She has taught at the University of Massachusetts, Mount Holyoke College, Westfield State College, Holyoke Comunity College, and the Consumer Cooperative at Gomel, Belarus. She received a B.S. and M.S. from the University of Massachusetts and holds a Ph.D. from the University of Connecticut. Read More Read Less