Chairman of the Research Group Caracas, Venezuela. "Surfaces and Interfaces Engineering". January 1987 - Present.

Vice-President . Wear Research January 1980 -January 1982.

July 1974 - November 1979

Metallurgist III. July 1972 - July 1974.

Research Associated in Berkeley, California. U.S.A. Materials Science. - Metallic Surfaces-. (Prof. J. Washburn Group). September 1968 - July 1972.

Research Associated -Solid State Physics (Crystallography)-. (Prof. R. Pepinsky Group). September 1967 - September 1968

Research Assistant in Berkeley, California. U.S.A. Solid State Physics. (Cyclotrone Resonance). (C. Kittel Group). August1960 - December 1962.