Professor David J. Farber, whose work on academic experimental computer networks helped define the evolution of the early internet, died on February 7 at age 91 (Peter Wayner/New York Times)

Peter Wayner / New York Times:
Professor David J. Farber, whose work on academic experimental computer networks helped define the evolution of the early internet, died on February 7 at age 91  —  A researcher, professor and federal policy adviser, he guided students who went on to do groundbreaking work in connecting the world online.