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While he was a student at Salem State College (now Salem State University), Costello spent three years organizing and leading a program that resulted in student's building desperately needed housing for some of the poorest Americans living in Appalachia.
After earning a master's degree in Guidance and Counseling from Salem State College in 1980, she worked at North Shore Technical High School in Middleton, Massachusetts for twenty-one years as a guidance counselor.