Associate justice On January 24, 1991, Davide was appointed by then-President Aquino as associate justice of the
Supreme Court. From January 2, 1996, to August 30, 1997, he sat as a member of the
Senate Electoral Tribunal. He was also the working chairman of the court's Third Division from January 2, 1996, to September 7, 1997, and chairman of the House of Representative Electoral Tribunal from September 1, 1997, to November 30, 1998.
Chief justice On November 30, 1998, he was appointed by President
Joseph Estrada as the 20th chief justice of the Supreme Court of the Philippines. He took his oath of office at the new Bonifacio Shrine in the City of
Manila. He became known as the Centennial and Millennial Chief Justice. He was the presiding judge in the impeachment trial against then-President
Estrada in December 2000. When the popular protests spilled into the streets, his timely intervention on behalf of "the welfare and will of the people" by administering the oath of office as president to then-Vice President
Gloria Macapagal Arroyo. By declaring her the constitutional successor it averted potential violence and military takeover of power, and brought the crisis to an end. Although the
moral authority of the Supreme Court carried the day, Davide's action was further bolstered by a precedent setting Supreme Court decision, effectively putting an end to the question of the legitimacy of Arroyo's succession to power. as President of the Philippines.
Post-judicial career Davide retired as
chief magistrate on December 20, 2005, after he reached the mandatory retirement age of 70. However, on January 24, 2006, President
Arroyo appointed him as senior presidential adviser on electoral reforms during a Council of State meeting convened by the president. He recommended measures and policies to the president that would help reform the country's electoral system. ==United Nations==