Gregory S. Chirikjian received his PhD from the California Institute of Technology in 1992. He is Professor of Mechanical Engineering, with a secondary appointment in Computer Science, Applied Mathematics, and Statistics, at the Whiting School of Engineering at Johns Hopkins University. Alexander B. Kyatkin received his PhD in physics from Johns Hopkins University in 1996. He has conducted research in harmonic analysis on the motion group, computer vision, numerical algorithm development, and high energy particle physics. He currently works on developing software.