Representative Garballey was elected to Town Meeting in his community at the age of 18. He was elected to the Arlington School Committee at the age of 20. At the age of 22 he was elected to the Massachusetts House of Representatives. Sean Garballey is the Massachusetts State Representative for the 23rd Middlesex District which includes the communities of Arlington and Medford. Representative Garballey serves as the Chairman of the House Committee on Global Warming and Climate Change and serves on the Joint Committee on Higher Education.