Chadwick was elected deputy for the District #33 in 1989, and was re-elected in 1993. In 1997, he was elected senator for the 9th Circumscription of the VI Región del Libertador General Bernardo O'Higgins, and was re-elected in 2005 again. On 18 July 2011, he was invited by his cousin, President Sebastián Piñera, to become Minister Secretary General of Government. He was later appointed Interior Minister on 5 November 2012 and his term ended on 11 March 2014. He joined the second government of Piñera on 11 March 2018 as Interior and Public Security Minister and held that position until 28 October 2019.
Andrés Pío Bernardino Chadwick Piñera was born on 2 January 1956. His parents were Herman Chadwick Valdés and Paulette Piñera Carvallo (sister of Bernardino Piñera). He is also first cousin of President Sebastián Piñera.
Chadwick is currently married to María Victoria Costa Vega, with whom he has four children.
Chadwick was a vocal supporter of the Pinochet dictatorship, which had previously appointed him president of the Catholic University Students Federation.[6]
In 2012, he expressed "deep repentance" for this support after discovering "over the years" serious human rights violations committed by the dictatorship, while defending the regime on other grounds.[7]
Chadwick was appointed president of the Students Federation of the Catholic University of Chile (FEUC) by the military regime, and later graduated as a lawyer from the Pontifical Catholic University of Chile, later working as a professor. In the 1980s, Chadwick holds office in several political charges, such as in the Youth sections of the Independent Democrat Union Movement, National Unity, and National Renewal.