In 1928, Thomas Midgley, Albert Henne, and Robert McNary synthesized the first chlorofluorocarbons (trademarked as Freon in 1930), ushering in safe refrigerators and air conditioning (other coolants eventually replaced Freon).
Maslow helped a bit by giving a list of people he felt had reached self-actualisation: Abraham Lincoln, Thomas Jefferson, Albert Einstein, Eleanor Roosevelt, William James, Albert Schweitzer, Benedict Spinoza and Aldous Huxley, as well as 12 unnamed people alive at the time Maslow did his research.
The Sheldon's holdings sound a roll call of America's significant painters, from luminaries such as Albert Bierstadt, Willem de Kooning and Thomas Eakins to others such as Fairfield Porter, Maurice Prendergast and Ben Shahn.