Castle performs on the electric six-string violin[2] music from a range of genres, including Hendrix, Celtic, Bluegrass, and Mozart.

Castle earned money as a street musician while attending Columbia University where he received a Cum Laude degree in English and Comparative Literature.

[14] Castle organizes a series of "Celtic Christmas" and "St. Patrick's Day Celebration" concerts in theaters throughout the Northwest US.

[17] Castle's schedule includes performances and workshops at schools around the United States, raising funds for student music programs.

[2] Castle, along with 400 members of school orchestras in the Seattle area, set a world record for the most string players under one roof.