[3] He is the son of Octavio Errázuriz Letelier and his wife Virginia Guilisasti Tagle.

He was also president of the extension of the Universidad San Sebastián between 2014 and 2018 and was a member of the Public Policy Council of Libertad y Desarrollo and the advisory council for the Center for International Studies of the Universidad Católica.

[6] At the Ministry of Foreign Affairs, he held, among other positions, director general of foreign policy, adviser for Pacific affairs, and director of Asia-Pacific and Oceania.

As Chile's representative in Washington DC, he had to face the diplomatic conflict that was triggered between the two countries by the detection of two grapes contaminated with cyanide in March 1989.

In 2010 he was appointed ambassador to the United Nations by President Sebastián Piñera, after being considered a representative in Brazil.