Donald E. Coles, Professor of Aeronautics, Emeritus, passed away on May 2, 2013 at the age of 89. Professor Coles made pioneering contributions towards our understanding of boundary layers, turbulent shear flows, bluff-body aerodynamics, and novel experimental methods in fluid dynamics. He was a member of the National Academy of Engineering and a Fellow of both the American Institute of Aeronautics and Astronautics and the American Physical Society. In 2011 he was honored with the Donald Coles Lecture in Aerospace. He remained active till his passing, working on a book on Turbulent Shear Flow that is very near completion. [Caltech Obituary]
