Member of Scientific Societies
- Frontiers of Science (Chilean Academy of Sciences), Selected member, 2007 - 2009.
- Since 2006: Honorary Associate Member of the Sociedad Peruana de Matematica Aplicada y Computacional (SPMAC), Lima - Peru.
- Member of the International Scientic Committee Working Group on Generalized Convexity (WGGC), 2006 - 2009; 2009 - 2012, www.genconv.org.
- Corresponding Member of Academia Nacional de Ciencia y Tecnologia (ANCyT), Lima - Peru, from 2005.
- Since 1999: Active member of the American Mathematical Society, U.S.A..
- Since 1998: Active member of the Society for Industrial and Applied Mathematics, U.S.A..
- Since January 1994: Active member (since January 2000: member of the Scientic Committee) of the Sociedad de Matematica de Chile.
- Since 1997: Active member of the Working Group on Generalized Convexity, within the Math- ematical Programming Society.
- 1998 - 2005 ; 2009 - 2014 Regular Associate member of the Abdus Salam International Centre for Theoretical Physics, Trieste - Italy.
- January 1996 to December 1998: Active member of the New York Academy of Sciences.