Interventional Management Services. IMS is a physician-owned ASC management and development company that focuses on pain management physicians. Centers managed by IMS range from one-room, single-specialty centers to large multi-specialty physician/hospital joint ventures. The company has corporate offices in Atlanta and affiliate ASCs in Georgia, Texas and New Mexico, and it continues to expand throughout the country. The company is led by CEO Stephen Rosenbaum, who created the company with Robin Fowler, MD, in 2008 and is responsible for the day-to-day operations of 10 healthcare companies and over $35 million in annual revenues. Dr. Fowler, who serves as the company's medical director, has been one of the leading pain practitioners in the east Atlanta area since 2005 and has performed more than 5,000 epidurals and pain procedures.