Keywords: Jack Brennan (1969).jpg John Jack Vincent Brennan born August 16 1937 is a retired United States Marine Corps Reserve officer and former political aide He is best known as being U S President Richard Nixon's post-resignation chief of staff Derived cropped from File Nixon Opening Day 1969 Two jpg<br>Original source Richard Nixon Presidential Library and Archives 1969-04-07 Robert L Knudsen White House photographer PD-USGov DEFAULTSORT Brennan Jack Assistants to the President of the United States People of Fall River Massachusetts Alumni of Providence College Officers of the United States Marine Corps United States military people of the Vietnam War Richard Nixon 1937 births Recipients of the Bronze Star Medal United States Recipients of the Purple Heart United States |