Wall left home at 18, and moved to Ann Arbor, Michigan, where he promoted concerts at the University of Michigan and other Midwest colleges. After he was asked to provide a portable stage for a George Harrison show, Wall founded a portable staging company, Stage One, Inc. Within several years, the company had become the largest of its kind, providing lighting, staging, and outdoor production for stadium and arena tours for The Rolling Stones, Led Zeppelin and The Who, among other artists.