Smith and Columbia president Seth Low worked to open Columbia classes to Barnard students. By 1900 they could attend Columbia classes in philosophy, political science, and several scientific fields. That year Barnard formalized an affiliation with the university which made available to its students the instruction and facilities of Columbia. Franz Boas, who taught at both Columbia and Barnard in the early 1900s, was among those faculty members who reportedly found Barnard students superior to their male Columbia counterparts. From 1955 Columbia and Barnard students could register for the other school's classes with the permission of the instructor; from 1973 no permission was needed.