Israel Montano Osorio worked as a university lecturer for ten years. He joined ANDES 21 DE JUNIO in 1985 and has held several union management posts. He has been secretary of the San Miguel (El Salvador) Section Board, secretary of the San Miguel Department Board, head of organization of the Eastern Zone and national representative of the Management Team. He was a full member of the Tribunal Calificador de la Carrera Docente from 2002 to 2006, a reserve deputy for the leftist FMLN party from 2006 to 2009 and a member of the EILA Regional Committee between 2007 and 2014. He has been General Secretary of ANDES 21 DE JUNIO since 2007.