In September of 1895, Coolidge began his lawyer apprenticeship under John C. Hammond and Henry P. Field, both attorneys in Northampton, Massachusetts. Coolidge applied himself to studying law, and in 1897, Coolidge was admitted to the Massachusetts bar. Just the next year, he opened his own law firm in 1898, and built up his reputation. He was noted for his equality in representation, by helping the poor and providing an attainable service.