D G O'Brien Inc was acquired by Teledyne Technologies Inc. D. G. O'Brien provides design and manufacture of electrical and optical interconnection solutions for a variety of demanding applications including: Submarine Hull Penetration Systems, Oil & Gas Subsea and Downhole Systems, Nuclear Power Systems, and Oceanographic Vehicles & Systems. The firm's primary expertise lies in designing connection systems for high pressure, highly corrosive, subsea and nuclear systems.