From LoC authorities, probably from preface to edition of his saxophone quartet:
pseud. of William James Robjohn; born in Tavistock, Devon, England in 11-2-1843. Died in Morgantown, N.C., 11-21-1920. A composer, choral conductor and teacher active principally in New York and N. Carolina. Assumed pseudonym of Caryl Florio in 1870.