 From 1959 to 1962, he served as Dean of the College of Arts and Sciences at Kansas State University.Hahn returned to Virginia Tech as President on July 1, 1962, where he remained until 1975.He was instrumental in Virginia Tech's transition from a small, primarily military, and overwhelmingly white and male technical institute focused on agriculture and engineering that emphasized undergraduate teaching over research or graduate program to, symbolized by its new name, Virginia Polytechnic Institute and State University, a coeducational, multiracial research university with a thriving college of arts and sciences and burgeoning graduate program.