J. Robert Oppenheimer
Lambert figured prominently in the U.S. Atomic Energy Commission's investigation and decision to relieve Dr. J. Robert Oppenheimer, Director of the Manhattan Project at Los Alamos, of his security clearance because of documented close associations which Oppenheimer repeatedly denied, yet ultimately admitted to. In a subsection review 'As to "character"' on 29 June 1954 in the "Decision in the Matter of Dr. J. Robert Oppenheimer", the Commission wrote,