Davis Wineland received the 2012 Nobel Prize in Physics for “his ground-breaking experimental methods that enable measuring and manipulation of individual quantum systems.” A graduate of the University of California, Berkeley (B.A. 1965) and Harvard University (Ph.D. 1970), he has been a member of the Time and Frequency Division of NIST (National Institute of Standards and Technology) in Boulder, Colorado since 1975, where he is a group leader and NIST Fellow. A long-term goal of his work has been to increase the precision of atomic spectroscopy, the measurement of the frequencies of atoms’ characteristic vibrations. This research has applications to making better atomic clocks and has led to experiments showing precise control of atomic energy levels and motion. Such control can be applied to measurements whose precision is limited only by the constraints of quantum mechanics and to demonstrations of the basic building blocks of a quantum computer.