Columbia University [Science professor.]

Columbia University [Science professor.]

Columbia University [Science professor performing an experiment.]

Columbia University [Science professor performing an experiment.]

Columbia University [Sculpture professor.]

Columbia University [Sculpture professor.]

Columbia University [Sculpture professor.]

Columbia University [Sculpture professor.]

Columbia University [Sculpture professor.]

Columbia University [Sculpture professor.]

Columbia University [Sculpture professor.]

Columbia University [Sculpture professor.]

Columbia University [Professor with a student.]

Columbia University [Professor with a student.]

Columbia University [Sculpture professor.]

Columbia University [Sculpture professor.]

Columbia University [Sculpture professor.]

Columbia University [Sculpture professor.]

Columbia University [Professor teaching a class.]

Columbia University [Professor teaching a class.]