Mr. Capen was born and educated in Brooklyn and served an apprenticeship in architecture in the local office of the late A. J. Bloor. Prior to 1902 he opened an office in Newark and continued practice until the time of his death, engaged in designing various public buildings in the state. Among these were the Isolation Hospital group, Essex County Hospital, 1905; Tuberculosis group at the County Hospital, 1912; County Hospital at Verona, and the Jarvis Memorial Building, Bloomfield.
He was elected to the New Jersey Chapter, A. I. A. in 1902 and raised to Institute Fellowship the year before his death. He was also a member of the New Jersey Society of Architects.