Rubin is the Deputy Permanent Representative of El Salvador to the United Nations and before that post was Minister Counselor, in charge of human rights and social affairs> He also held the post of International Civil Society based in Tokyo, Japan for seven years were he earned his MA degree in International Politics at Aoyama University. Rubin is fluent in Japanese and four other languages besides his native Spanish.
From the UN Website: RUBÉN ARMANDO ESCALANTE HASBÚN supported the fruitful work done on crime prevention and criminal justice, in particular towards the elimination of violence against migrants, migrant workers and their families, which was the subject of one of the resolutions currently before the Council. Ecuador made that issue a priority and, therefore, was one of the sponsors of that text. However, it felt that it could include other elements, such as the importance of a larger number of ratifications to the Convention on the Rights of Migrants and their Families.