In 1891 he obtained a position as secretary to the chief
postal inspector of New York. The following year, a promotion led to a position as secretary to the Fourth Assistant Postmaster General in
Washington, D.C. In 1895, President
Grover Cleveland hired Cortelyou as his chief clerk on the recommendation of Postmaster General
Wilson S. Bissell. Cleveland recommended him as
personal secretary to his successor,
William McKinley. Cortelyou was working to improve the efficiency of the office when President McKinley was assassinated in 1901. He was the third president to be assassinated. McKinley was greeting visitors at the Temple of Music at the
Pan-American Exposition in
Buffalo, New York, on September 6, 1901, when he was shot twice at close range by lone assassin
Leon Czolgosz, a twenty-eight-year-old anarchist. As McKinley collapsed, he was caught and supported by his aides, including Cortelyou. As he was held in their arms, he whispered, "My wife... be careful, Cortelyou, how you tell her. Oh, be careful." He died eight days later at the age of fifty-eight. After succeeding McKinley as president,
Theodore Roosevelt charged Cortelyou with transforming the White House into a more professional organization. Cortelyou developed procedures and rules that guided White House
protocol and established processes for which there had been only personal prerogative. Cortelyou is also credited with establishing an improved line of communication between the President's office and the press; he provided reporters with their own work space, briefed journalists on major news events, and distributed press releases. Cortelyou is credited with establishing the first systematic collection of press clippings for a sitting president to review. The "Current Clippings" were the first attempt by a president to gauge
public opinion through the media. Cortelyou selected the articles objectively, a practice not consistently followed by his successors. ==Roosevelt's administration==