 He also designed the Washington Street Elevated, the Theodore Parker Church in West Roxbury, the Merrill Memorial Library in Yarmouth, ME, the Curtis Memorial Library in Brunswick, ME and a Maine Historical Society library building.He served on the board of directors of the Dedham Pottery company and designed their plant.Longfellow was one of the founders of The Society of Arts and Crafts of Boston, active in the Boston Marine Museum, and a trustee of the Boston Museum of Fine Arts and the Boston Athenæum.