The Mayo Clinic is the first and largest integrated, not-for-profit medical research and practice group in the world. Doctors from every medical specialty work together to care for patients, joined by common systems and a philosophy of "the needs of the patient come first." More than 3,300 physicians, scientists and researchers and 46,000 allied health staff work at Mayo Clinic, which has sites in Rochester, Minn., Jacksonville, Fla., and Scottsdale/Phoenix, Ariz. Collectively, the three locations treat more than half a million people each year.

The Mayo Clinic conducts a wide range of translational medical research aimed at improving patient care. That includes foundational laboratory and applied studies; bioengineering and bioinformatics; population research (epidemiology); and clinical trials. Nationally, 6,000 staff members are involved in the research effort, including 80% of Mayo's physicians.

The Mayo Clinic is also home to five schools: Mayo Medical School, Mayo Graduate School, Mayo School of Graduate Medical Education, Mayo School of Continuing Medical Education, and Mayo School of Health Sciences.

In Best Hospital of the year 2014-2015 published on US News and World Report on July 15, 2014, the Mayo Clinic topped the list.