Benjamin Banneker (Nov. 9, 1731 – Oct. 9, 1806)
Banneker was an astronomer, mathematician and author who constructed America’s first functional clock. In the early days of the U.S., Banneker was a prominent abolitionist working with Thomas Jefferson on improving the lives of Black people in this nation. He was also one of the few people to help survey the borders of Washington, D.C.
Dr. Daniel Hale Williams (Jan. 18, 1858 – Aug. 4, 1931)
Williams performed the first prototype open-heart surgery. He also was the second surgeon to perform a pericardium surgery to repair a wound. In 1891, he created one of the first non-segregated hospitals in the U.S. He called it Provident Hospital and it was located in Chicago.