Conductor of the Opera Company of Philadelphia. Frank Hamilton, Performance Chronology 1975-2004 (frankhamilton.org/ph/ocp.pdf, via web.archive.org/web/20051227121114/http://frankhamilton.org/ph/ocp.pdf) gives -maestro direttore Carl Suppa- for Norma at the Academy of Music, Philadelphia, 10 January 1978; operadis (CLBLNORM.HTM, entry 68) lists the same performance as -Conductor Carl Suppa - 1978(LI), Opera Company of Philadelphia-. No findopera conductor matched -supp- before this.