1.- Head of the Polymer Laboratory (SecciónPolímeros, Lab. B), Universidad Simón Bolívar, 1991-2013
2.- Head of the Polymer Group from Universidad Simón Bolívar (GPUSB, Grupo de Polímeros de la Universidad Simón Bolívar), 1991-present.
3.- Vice-Dean of Research in the Area of Applied Science and Engineering, Universidad Simón Bolívar, Jan. 1997- Dec. 2000.
4.- Member of the Commission for Promotion of Research in Venezuela (PPI, Plan de Promoción al Investigador) in the Area of Applied Sciences and Engineering. Caracas, Venezuela, during the terms: 1998-1999 and 2002-2003.
5.- President of the Venezuelan Polymer Society, since 2004 until 2016.
6.- Since September 2013 IKERBASQUE Research Professor at POLYMAT and at the Faculty of Chemistry, University of the Basque Country (UPV/EHU) in Donostia-San Sebastián, Spain.
7.- Member of the RHEOLOGY GROUP of POLYMAT: http://www.ehu.eus/es/web/polymat/rheology-people and of the Consolidated Group of Rheology of the Basque Country coordinated by Prof. Antxon Santamaria: http://www.polymat.eu/en/people/senior-researchers/alejandro-muller
8.- “Senior Researcher” of the Basque Center for MACROMOLECULAR DESIGN & ENGINEERING (BERC POLYMAT).
9.- Founder and Head of the Advanced Multiphasic Polymers (AMP) Group: http://www.polymat.eu/en/groups/Advanced%20Multiphasic%20Polymers%20(AMP)%20Group
10.- POLYMAT Seminar Coordinator for the academic years 2015-2019.