Professor H. C. Willett, Dr. Robert A. Millikan, Dr. Willis Gregg, Lieut. T. J. O'Brien, Dr. Theodore Von Karman, and Capt. A. H. Thiessen gather at conference, Pasadena, 1934 Description: The men stand tightly together in front of an open door. Date: June 1934 Resource Type: still image Collection: Los Angeles Times Photographic Collection