Dr. Jack Hagadorn and Dr. Reinhard Marthen, along with Administrator Jack Hammett, founded Bristol Park Medical Group in 1961. It provides patient-focused healthcare to the Costa Mesa area in Orange County, Calif. The group has more than 10 medical offices, 90 primary care physicians and physician assistants, and 600 employees to support the clinical and business operations. Bristol Park Medical Group primary care provider also arranges for other physicians, hospital care and community services. It has close working relationships with many of Orange County's leading hospitals. It accepts major health maintenance organizations and preferred provider organization health plans, as well as Medicare, private indemnity and supplemental insurance plans.