His appointment is one in a series of executive transitions at the McLean, Va.-based consulting firm as both Vice Chairman Mike McConnell and Chief Financial and Administrative Officer Samuel Strickland will both retire on June 30, Booz Allen said Friday.
Cook will succeed the retiring Samuel Strickland as CFO and Chief Information Security Officer Joseph Mahaffee will assume Strickland’s other role as chief administrative officer, also on July 1.
Strickland will also step down from his role on the firm’s board of directors when he retires.
“Mike and Sam have spent years building the firm’s capabilities and mentoring the next generation. Sam has led our firm through significant changes in capital structure and market conditions. Mike is one of the world’s leading cyber experts, and has contributed immeasurably to our nation and the firm,” said Ralph Shrader, Booz Allen chairman and CEO.
Both McConnell and Strickland will hold senior executive advisory roles after retirement.
Cook, a two-decade firm veteran across two stints, returned to Booz Allen in 2003 after seven years as senior vice president of client development for JAMIS Software and first joined Booz Allen in 1986.
Mahaffee worked as an information security engineer with the Defense Department before joining the firm in 1981.
Strickland has held his director and CFO roles at Booz Allen since 2008 and has served as chief administrative officer since 2006.
McConnell, formerly national intelligence director from 2007 to 2009, has served as vice chairman since 2011.