Affiliations Research 1925[position unknown]National Research Fellow In Zoology1930[position unknown]California Institute Of Technology1931[position unknown]California Institute Of Technology1926National Research Fellow In ZoologyColumbia University1927National Research Fellow In ZoologyColumbia University1928[position unknown]Columbia University1929Assistant In BiologyWashington Square College New York University 1925Zoology[role unknown]1926Zoology[role unknown]1927[subject unknown][role unknown]1928[subject unknown][role unknown]1929[subject unknown][role unknown]1930[subject unknown][role unknown]1931[subject unknown]Independent