Mayo Clinic is a not-for-profit medical practice and medical research group based in Rochester, Minnesota. It is the first and largest integrated not-for-profit medical group practice in the world, employing more than 3,800 physicians and scientists and 50,900 allied health staff. The practice specializes in treating difficult cases through tertiary care. It spends over $500 million a year on research. In 2014, Mayo Clinic marks 150 years of continuous service to patients. Dr. William Worrall Mayo settled his family in Rochester, Minn., in 1864 and opened a medical practice that evolved under his sons into Mayo Clinic. Mayo Clinic has been near the top of the U.S. News & World Report List of "Best Hospitals" for more than 20 years. The practice is distinguished by integrated care. It has been on the list of America's "100 Best Companies to Work For" published by Fortune magazine for eight years in a row. read more