The Walton lecture brought crowds to Cotsen Hall on March 2, and, to the Museum of Byzantine Civilization in Thessaloniki where it was repeated for the first time ever, on March 4th. Watch it now: Byzantine Constantinople: Visualizing a City in Transition.  Robert Ousterhout (University of Pennsylvania), Cotsen Hall, March 2, 2010. Running time: 62 min. The ASCSA would like to thank Lloyd E. Cotsen for the Gennadius Lecture Series. The Thessaloniki lecture was made possible thanks to the initiative and support of the Archaeological Institute of Macedonian and Thracian Studies, the Museum of Byzantine Civilization, and the European Center for Byzantine and post-Byzantine Monuments.