Born in 1974, he is the eldest son of Hernan Larraín and Magdalena Matte,[1] politicians whose families have had a vast trajectory both into the Chilean elite and that country's right–wing.

Following Piñera's victory at 2009 presidential election, he joined to Renovación Nacional (RN) in 2010 and became President's communications advisor since that year until 2013.

In December, he participated in the presidencial campaign of Evelyn Matthei (UDI) who lost against Michelle Bachelet from centre–left's Socialist Party of Chile.

In mid-2017, Larraín helped to Felipe Kast in the coalition's presidential primary[2] that lost (15%) against Piñera (58%) and Manuel José Ossandón (26%).

[4][5] On July 19, 2020, in the midst of Chile Vamos crisis (after 2019–20 Social Outbreak and COVID-19 pandemic), he formalized his resignation as president of the organization.