1977-1984: Research Scientist, Lamont-Doherty Earth Observatory, Palisades, N.Y., USA
1994-present: Professor of Earth Sciences at Simon Bolívar University, USB, Caracas
2000 & 2001: Visiting Professor at the University of Oxford, U. K., Dpt. of Earth Sciences
Head of the USB Commission and Founder of the Graduate School of Earth Sciences at Simon Bolivar University, 1997-1998
1998-present: Founder and Head of the GPS Geodesy Lab, Dpt. Earth Sciences, Simon Bolívar University
2007-present: President of the Executive Committee, IPP-USB, Institute for Professorial Social Affairs of Simon Bolivar University
Current Member of the Engineering, Technology and Earth Sciences Committee, Dean of Research Office, Simon Bolivar University
Current member of the USB Academic Vice Rectorate Commission for Sabbaticals awards
Current member of the USB Academic Vice Rectorate Commission for Special Bonus for Research awards
Member of the Board of Directors (2009-2012) of the Professorial Fund for Retirement of Simon Bolivar University (Fonjusibo)