Columbia College Dean James J. Valentini, Columbia Engineering Dean Mary C. Boyce, Dean of Undergraduate Admissions and Financial Aid Jessica Marinaccio and Columbia admissions officers mailed acceptance letters to regular decision applicants in the Class of 2018. These students were chosen from one of the largest applicant pools in Columbia’s history at a 6.94 percent admit rate and represent all 50 states, Washington, D.C., and the U.S. territories, as well as nearly 80 countries.