Garrison studied at the Pennsylvania Academy of Fine Arts in Philadelphia and with Gutzon Borglum.
These included the three sculptural panels for the RKO Building at the Sixth Avenue entrance of Rockefeller Center in New York City.
He also completed a heroic figure at West Point, and sculptural details for the Boston Avenue Methodist Church in Tulsa, Oklahoma, a National Historic Landmark.
The Denver Botanic Gardens[2] has a terracotta frieze depicting, among things, two hunters with shotguns shooting at a buffalo.
Garrison also designed the Civic Center Park's Seal Pool's two fountains, a pair of bronze mountain lions for the entrance of the State Office Building and the gargoyles at Denver's South High School.