Sir Frederick Gowland Hopkins by Meredith Frampton, 1938
via kraftgenie on Flickr.
“Sir Frederick Gowland Hopkins (20 June 1861 – 16 May 1947) was an English biochemist who was awarded the Nobel Prize in Physiology or Medicine in 1929, with Christiaan Eijkman, for the discovery of vitamins. He also discovered the amino acid tryptophan, in 1901. He was appointed President of the Royal Society from 1930 to 1935.”(via Wikipedia)