He taught in Minneapolis , Duluth , Dayton , Ohio , Ithaca ( Cornell University ) , Pennsylvania ( Penn State ) and New York City . He then taught in Minneapolis , Duluth , Dayton , Ohio , Ithaca ( Cornell University ) , Pennsylvania ( Penn State ) , and New York City .
Beliau mengajar di Minneapolis, Duluth, Dayton, Ohio, Ithaca (Universiti Cornell), Pennsylvania (Negeri Penn) dan New York City. Beliau kemudian mengajar di Minneapolis, Duluth, Dayton, Ohio, Ithaca (Universiti Cornell), Pennsylvania (Negeri Penn), dan New York City.