7. Leonidas BerryLeonidas Berry was a pioneer in gastroscopy and endoscopy. He invented the first direct-vision instrument, better known as the gastroscopy scope, to remove diseased stomach tissue.
Berry received his first bachelor’s degree from Wilberforce University in 1924, according to a Wikipedia page about him. He received his second bachelor’s degree from the University of Chicago. Berry went on to get his M.D. from Rush Medical College of the University. In 1933, he got his M.S. degree in pathology from the University of Illinois Medical School.
Berry worked at Cook County Hospital in Chicago where he specialized in gastroenterology. He retired in 1975 as chief of endoscopy.