Expert Anesthesiology. Smart Care. That's OAG. Since our formation in 1989, we have grown steadily to become one of the country’s largest physician owned anesthesia practices. OAG provides expert anesthesia services at a variety of hospitals, surgical centers, and clinics throughout the Portland metro area. With over 200 employed physicians and CRNAs, OAG is uniquely positioned to provide a well-managed, growth environment for you to expand your career. ​