Heike Kamerlingh Onnes's Laboratory in Leiden, Netherlands, July 1927. Oppenheimer is in the middle row, second from the left.
University of California Radiation Laboratory staff, including Robert R. Wilson and Nobel prize winners Ernest Lawrence, Edwin McMillan, and Luis Walter Alvarez, on the magnet yoke for the 60-inch (152 cm) cyclotron, 1938. Oppenheimer is the tall figure holding a pipe in the top row, just right of center.