In 1945, he began his public service as prosecutor in the Department of Justice, assuming later the position of head of the office of special prosecutors. Four years later, he was appointed judge-at-large of the Court of First Instance and the following year was named district judge for Albay and Catanduanes. He was appointed Solicitor General in 1952, a position he held until 1954.[2]
President Diosdado Macapagal made him Undersecretary of Justice in 1961 and on May 19 of that year, appointed him as Secretary. He served from May 20, 1962, to July 7, 1963. It was the time of the Stonehill scandal and as Secretary of Justice, Liwag had the huge task of prosecuting the American and his associates. He was also responsible for busting the credit scandal in the Philippine National Bank and the naturalization racket that had flourished unabated over the years.
Liwag declared the daily wage of ₱2 of emergency employment administration workers as unconstitutional and inhuman. In his own department, he secured salary increases for judges, solicitors, fiscals, prosecutors and court personnel.
As a member of the Senate, from 1963 to 1969, Liwag headed two important committees—the Committee on Revision of Laws and the Committee on Government Reorganization. He became a member of the committees on accounts, economy, investigation, justice, labor and immigration, national defense and public works and communications.
In 1970, he was elected to represent the 2nd district of Nueva Ecija at the 1971 Constitutional Convention.
In his honor, the main public high school in his hometown, Gapan, was renamed Juan R. Liwag Memorial High School through Batas Pambansa Blg. 858 on April 27, 1984.[5] Liwag was responsible for elevating the status of the school to a national high school.
Personal life
He was married to Consuelo Joson with whom he had four children namely Diego, Ramon, Aurelio and Rita.[6]
