Affiliations Research 1923Research FellowJohns Hopkins University1914University Scholar In ZoologyColumbia University1915[position unknown]Columbia University1917Assistant In ZoologyColumbia University1922Research FellowColumbia University1919InvestigatorCarnegie Institution 1914Zoology[role unknown]1915Zoology[role unknown]1917Zoology[role unknown]1919Zoology[role unknown]1922Zoology[role unknown]1923[subject unknown][role unknown]