In 1989 he was appointed magistrate of the technical cabinet of the president of the Supreme Court.
He has been a member of the National Commission of the Judicial Police since 1993 until his appointment as Judge of the Second Chamber of the Supreme Court.
In 1998, aged 43, he became the youngest judge to enter the Supreme Court when he received the support of 11 of the 18 members of the General Council of the Judiciary (CGPJ).
In 2017, Andrés Martínez Arrieta was appointed a new magistrate of the High Court competent to hear about the activities of the National Intelligence Center (CNI).
He has been an associate professor in the Criminal Law Department of the Complutense University and professor of criminal law and criminal procedure at the San Pablo University, Business Institute and Legal Studies Center.
Author of legal publications: Accusatory principle; Appeal of cassation; Household control of the presumption of innocence; and publications with several authors.
Justice and Democracy Session