Charles Callahan is a native of Cambridge, Massachusetts. Callahan is well-known as an award-winning composer, organist, choral conductor, pianist, and teacher.

He is a graduate of The Curtis Institute of Music, Philadelphia, PA, and The Catholic University of America, Washington, D.C.
Additional study has been in England, France, Germany and Belgium.
He holds the Associate Certificate and the and Choirmaster Certificate of the American Guild of Organists.
Charles Callahan compositions are performed frequently in church and concert; his writing style has been described by The Washington Post as "gentle, confident lyricism". Among his notable compositions are two commissions from Harvard University and commissions from the Archdioceses of St. Louis and New York for Papal visits, scored for full orchestra, choir and congregation. His "Mosaics", a symphonic work in four movements for organ and orchestra, was premiered in the St. Louis Cathedral-Basilica.
An active church musician and concert organist, Charles Callahan has conducted many of the major choral works with orchestra and has performed on many of the great organs of the world.
Charles Callahan is frequently asked to advise on the design of new organs and the restoration and improvements to existing instruments. His two volumes on American organ building history, The American Classic Organ and Aeolian-Skinner Remembered, have become standard reference works.
An active church musician and concert organist, Charles Callahan has conducted many of the major choral works with orchestra and has performed on many of the great organs of the world.
He has a dozen solo organ recordings to his credit.
He is an award-winning member of the American Society of Composers, Authors and Publishers. He has most recently been honored by the American Guild of Organists with its 2014 Distinguished Artist Award "for his illustrious career as composer, performer, teacher and consultant, and his lifelong service to the sacred music profession".