Columbia University [Three professors talking.]

Columbia University [Three professors in front of a chalkboard.]

Columbia University [Three professors in front of a chalkboard.]

Columbia University [Three professors talking in front of a chalkboard.]

Columbia University [Three professors in the front of a classroom.]

Columbia University [Three professors talking in the front of a classroom.]

Columbia University [Three professors talking in the front of a classroom.]

Columbia University [Professor teaching a class.]

Columbia University [Professor teaching a class.]

Columbia University [Sculpture professor.]

Columbia University [Sculpture professor.]

Columbia University [Sculpture professor.]

Columbia University [Sculpture professor.]

Columbia University [Science professor.]

Columbia University [Sculpture professor.]

Columbia University [Sculpture professor.]

Columbia University [Sculpture professor.]

Columbia University [Sculpture professor.]

Columbia University [Three professors in front of a chalkboard.]

Columbia University [Sculpture professor.]