John Weaver (1937-2021) served as Organist and Director of Music at the Madison Avenue Presbyterian Church from 1970-2005. He also headed the Organ Department of the Curtis Institute of Music in Philadelphia from 1972-2003 and chaired the Juilliard School's Organ Department from 1987-2004. John's wife Marianne Weaver, flute teacher and performer, has played with many orchestral groups including the Holy Trinity Bach Orchestra in NYC, the American Wind Symphony, the Canterbury Chorale Orchestra, Musica Sacra and several light opera groups. She regularly plays in concert with John including performing a number of pieces for flute and organ that John has written over the years.

Prior to coming to Madison Avenue Church, John was organist and Director of Music at the Holy Trinity Lutheran Church on 65th Street and Central Park West from 1959 - 1970. While there, John and his wife, Marianne, started the famous Bach Cantata Series in 1968 - performing over 20 Bach cantatas each year in the context of evening Vesper services on the appropriate Sundays for those specific cantatas. Still running today, this is the oldest continuing series of its kind in the western hemisphere.