William W. Mayo immigrated in 1846, married and moved to Minnesota Territory. He was a surgeon in the Union Army in Rochester, Minnesota. In 1864 he opened his first medical practice. He was joined by both sons. They cared for survivors of a tornado, and with the help of Mother Alfred Moes and two hospitals formed the Mayo Clinic. Now, over 7,300 physicians and scientist, they saw 1.3 million patients in 2022.

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