Raymond and Beverly Sackler Foundation Scholar Joshua Lederberg, president emeritus of The Rockefeller University, gave the Raymond and Beverly Sackler Centennial Lecture on Fri., Jan. 26. His talk was entitled "Crowded at the Summit: The Future of Infectious Disease."

John W. Rowe, president and CEO of Aetna, Inc., presented a Zanvil Cohn Forum lecture entitled "Successful Aging," on Mon., Jan. 22.