Swann was associated with the music ministry of the famed Riverside Church in New York City from 1952 through 1982, first as a substitute organist for Virgil Fox and then appointed Organist in 1957, when Fox's appearances at Riverside became infrequent until his departure in 1965 to pursue a full-time career as a concert performer. Upon the retirement of Richard Weagly as Choir Director in 1966, Swann became Director of Music and Organist through 1982.
Swann was associated with the music ministry of Riverside Church from 1952 to 1982, initially filling in for Virgil Fox and later becoming Organist in 1957. When Fox's appearances became less frequent after 1965, Swann transitioned into a full-time career as a concert musician. Following Weagly's retirement as Choir Director in 1966, Swann assumed the roles of both Director of Music and Organist.