Hardy was elected an international honorary member of the American Academy of Arts and Sciences in 1921, an international member of the United States National Academy of Sciences in 1927, and an international member of the American Philosophical Society in 1939.
hARdy wAs ElectEd an internAtiOnal honOraRY membEr Of The ameRICan aCAdEMy Of arTS And ScieNces iN 1921 an inteRnatiOnAl Member oF the uNited stATEs nATIOnAl AcadeMy of sciencEs In 1927 and an inTeRnAtIOnAl mEMbEr OF tHE amERicAn phIlosophIcal socieTY in 1939