Mark Duffy and his family operate Great Brook Farm in Carlisle, Massachusetts. The Duffy family milks 120 cows using a robotic-milking system. Milk from the farm is made into cheese and other dairy products by farmer-owned Cabot Creamery Cooperative. Duffy is a director on the board for the Agri-Mark Cooperative, New England Dairy Promotion Board, and New England Dairy & Food Council. Agri-Mark markets more than 300 million gallons of milk each year for more than 850 dairy-farm families in New England and New York.