Inside the Texas Medical Center complex. Houston is home to the internationally renowned Texas Medical Center, which contains the largest concentration of world health and research institutions. The 47 member institutions of the Texas Medical Center are nonprofit organizations. Provide preventive and patient care, research, education and welfare of the local community, nationally and internationally. Employing over 73,600 employees, the medical center institutions include 13 hospitals and two centers, two medical schools, four nursing schools and schools of dentistry, public health, pharmacy, and virtually all health-related careers. That's where he created one of the first, and still the largest air emergency services, Life Flight, and where he developed a successful inter-institutional program.Most cardiac surgeries are performed in the Texas Medical Center, more than anywhere else in the world. Some of the academic medical institutions and research at the center include Baylor College of Medicine, Science Center Health, University of Texas at Houston, Methodist Hospital, Texas Children's Hospital and the MD Anderson Cancer Center, University of Texas. The latter has been ranked as one of the top two U.S. hospitals specializing in cancer care by U.S. News World Report since 1990. Houston is the headquarters of the Menninger Clinic, a renowned psychiatric treatment center affiliated with Baylor College of Medicine and the Methodist Hospital System.