About Mayo Clinic Mayo Clinic is a world renowned medical center that specializes in clinical practice, education and research. Based out of the U.S., the three main campuses are located in Arizona, Florida and Minnesota and this year alone they have treated over 1.3 million people from around the world who came to the clinic for care. Being the large institution that they are, they have roughly 64,000 personnel which speaks for everyone from physicians and scientists to administration and support staff. The main point of their  mission statement is that the needs of the patient always come first and this focus resonates strongly with all employees enabling them to provide an unparalleled patient experience.