Nathan G. Clark, SPE, was named senior vice president of perforating and technology at Geodynamics. He has more than 23 years of experience in the design and development of shaped charges, explosive devices, and completion tools used in the oil and gas industry. Clark has developed perforating systems for Western Atlas/Baker Atlas, Halliburton, and Geodynamics. He holds 21 US patents. He has completed special and classified projects for the United States Army, Air Force, Navy, Sandia National Laboratories, Los Alamos National Laboratory, and the United Kingdom Ministry of Defense.