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