1) US chemist 2) American Nobel chemsit 3) American physicist 4) Atom-pioneer Harold 5) Atomic scientist 6) Author of One World or None 7) Chemist 8) Chemist Harold 9) Chemistry nobelist harold 10) Chemistry nobelist in 1934 11) Chemistry Nobelist, 1934 12) Deuterium discoverer 13) Deuterium discoverer Harold Found on https://www.crosswordclues.com/clue/urey