Antonio José Navarro Wolff (born 9 July 1948) is an engineer, a former combatant and a Colombian politician. Navarro used to be a former Commandant and leader of the 19th of April Movement (M-19), a former guerrilla movement that operated in Colombia in the 1970s and 1980s. After the demobilization through a peace agreement of the M-19, Navarro and others formed the M-19 Democratic Alliance, a political party of which Navarro became a leader of entering mainstream politics in Colombia. In 1990 he ran as a M-19 political candidate during the Colombian presidential elections finishing third and receiving 12.48% of the votes; he ran again unsuccessfully in the 1994 presidential election, and attempted to run for the 2006 presidential elections but lost the candidacy of his party during the primaries. In 1991 he was elected to the National Constituent Assembly, of which became Co-President along with Álvaro Gómez Hurtado and Horacio Serpa Uribe; it was this Assembly that drafted the Colombian Constitution of 1991 which remains the supreme law of the country. Navarro has also served in Congress, being elected to serve both in the Chamber from 1998 to 2002, and the Senate from 2002 to 2006 and again since 2014; and elected Mayor of Pasto serving from 1995 to 1998, and Governor of Nariño from 2008 to 2012. Before M-19 Antonio José was born on 9 July 1948 in Pasto to Rafael Navarro Uribe and María Emma Wolff Pizarro. In 1972, Navarro graduated as a sanitary engineer from the University of Valle, after which he took postgraduate courses and eventually became a professor at the same university. He studied Environmental Engineering at Loughborough University, UK in 1976 on a scholarship from the Rockefeller Foundation, the British Council and the International Development Research Center (IDRC) of Canada. As a sanitary engineer, he was an adviser of the Social Medicine Department of the University of Valle (1972), coordinator of the Multidisciplinary Research Centre for Rural Development (CIMDER, 1972–1977), international adviser of the IDRC (1976–1978), Professor at the University of Valle (1972–1978), director of the Curriculum of Sanitary Engineering at the university, and a private consultant. Militancy in M-19 At the end of the 1970s, he became a part of the guerilla group M-19. Within the M-19, Navarro ascended to second-in-command of the organization. One of the most controversial episodes of M-19 was the take-over of the Palace of Justice by armed