A bit of his bio:
Jackson Berkey’s published catalog offers over 400 titles encompassing choral, solo vocal and instrumental, chamber ensemble, band and orchestral works, as well as concerti and works for chorus and orchestra.
Premières of commissions have taken place in America and abroad on university campuses and concert stages and by professional musicians and massed children’s choirs. He’s also had five choir/orchestra premieres at Carnegie Hall in New York. Past premières include his Piano Concerto, Organ Concerto, Concerto for Harp and Chamber Orchestra, and Suite for Two Pianos. Awards and honors come from the Midwest, First Prize in the New Music for Young Ensembles Composition Contest in New York City, First Prize at the Alienor Harpsichord Competition in Hilton Head (NC), and award-winning video scores.
https://www.benedictine.edu/special/berkey
https://www.youtube.com/watch?v=y0SgqkF1wJo
https://www.youtube.com/watch?v=ZGolAkhr6os
Yes, I know of him. He was a co-founder of Mannheim Steamroller as well.