I just looked him up in the 1900 census. He is living in Pittsfield at 19 West Street, which was the Wendell Hotel. The census taker has listed each resident as "head", though the transcriber as listed the first one as "head" and the others as "hired." The other residents near him in the census list are hotel employees. Rollin's occupation is genealogist, though the transcriber had no idea what to make of that.