John Collins Warren Jr.

John Collins Warren (May 4, 1842 – November 3, 1927) was an American surgeon and president of the American Surgical Association.

Warren was born in Boston, Massachusetts, on May 4, 1842 to Dr. Jonathan Mason Warren and Annie Crowninshield. He was the grandson of famed surgeon John Collins Warren, Sr. and the Secretary of the Navy, Benjamin Williams Crowninshield, and also the great-grandson of surgeon John Warren.

He was educated at Boston Latin School and at a private school run by Epes Sargent Dixwell, that was also attended by future Supreme Court Justice Oliver Wendell Holmes, Jr.. He graduated from Harvard College (1863) and from Harvard Medical School (1866). Warren then continued his medical studies abroad at the Imperial Hospital in Vienna, and at other hospitals in Berlin, Paris and London.

In 1869, Warren returned to Boston and opened a private practice. Warren held several positions at Harvard Medical School. He was instructor in surgery at Harvard, 1871–1882; assistant professor of surgery, 1882–1887; associate professor of surgery, 1887–1893; and professor of surgery from 1893 until his retirement in 1907.

Dr. Warren's principal area of expertise was the surgical treatment of tumors, particularly in the treatment of breast cancer. He developed a special knife for the dissection of breast tumors and had it produced by Codman and Shurtleff, makers of surgical tools.

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