Bill Castillo is a percussion instructor and composer from St. Louis, Missouri. Bill is currently a member of the percussion staff for Rockwood Summit High School Marching Band. Castillo was the Program Coordinator and an arranger for South County United Percussion based out of St. Louis, and has also written for and taught the Northwest High School percussion program. Before Northwest High School, Castillo was the coordinator for the Belleville East High School percussion program. His drumlines and percussion ensembles have won numerous awards across the country. He has held similar positions at Wentzville High School and Belleville West High School. Castillo is also an in demand arranger for numerous high school programs across the country.

Castillo has taught camps at Truman State University. He has performed with various ensembles in the St. Louis area and given percussion clinics across the country.

He is owner of Messy Desk Music, a company that specializes in music writing, engraving and recording. He has worked with Key Poulan Music, JKS Music, Lorenz Music and Tapspace Publications among other companies. Castillo has presented clinics on Virtual Drumline, Sibelius and Finale software across the country.

Castillo is a member of Phi Mu Alpha Sinfonia, a professional music fraternity for men. He is also a proud endorser of Innovative Percussion Sticks and Mallets, Pearl Drums and Adams Keyboards, and Remo Drumheads.

Bill is married to his wife Lori and they have two children.