	Piper was a Freemason, president of Seattle Turn "Verein" (society) (see Turners; a liberal German movement which produced several members of the Revolution of 1848), and member of the Seattle "Liederkranz", a German cultural club that sang and danced. He was also a member of the Pioneer Association of the State of Washington, a society of the state's early settlers, and he was one of the founders of the Seattle Chess Club and the Seattle Amateur Rifle Association.