Prior to his move to Tulsa he was the Director of Music at Grace Church, Newark, NJ, one of the prominent Anglo-Catholic parishes in the eastern United States.
Arndt is the recipient of numerous honors, including First Place awards at the West Chester University and Joan Lippincott Organ Competitions.
Arndt's teachers include Paul Jacobs, Ken Cowan, and Diane Meredith Belcher.
Composers including Jonathan Dawe, Christian Carey, and Conrad Cummings have dedicated new organ works to him.
In 2023 he commissioned Paean by Rebecca Groom te Velde, a work now published by Oxford University Press.