Description It only seems like every Embassy Suites and Hyatt hotel in the world is indebted to the pioneering designs of Atlanta powerhouse architect/developer John Portman. He is credited with bringing the atrium-centered hotel design into the mainstream. His development firm Portman Holdings specializes in hotel and skyscraper development as well as office property management. The company handles its own design and development, property management and leasing, asset management, and risk management services. Affiliate AMC owns and operates the AmericasMart Atlanta trade show center. Portman founded the company in 1953.