Northrop Grumman Corporation announced the appointment of Robert L. Gunter and Matthew J. Mulherin as sector vice presidents, effective June 1. programs. waterfront services for the Newport News sector. supplies outage services for the power generation industry. aircraft carrier programs and vice president of engineering. repair, engineering and construction. master's degree in engineering from Virginia Tech. programs,” said Mike Petters, president, Northrop Grumman Newport News. Gunter replaces John E. Shephard, Jr. corporation to pursue other personal and professional objectives. News and we will miss his leadership,” said Petters. programs, carrier overhaul and the Virginia-class submarine program. programs. development to production increases,” said Petters. test engineer.