| PRESIDENT (2012) Philippine Society of Oncology, Inc.
 (Member since 2002)
 
 
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| VICE PRESIDENT (2011) Philippine Society of Oncology, Inc.
 (Member since 2002)
 
 
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| TREASURER (2010) Philippine Society of Oncology, Inc.
 (Member since 2002)
 
 
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| COUNCIL OFFICER (2008-2009) Philippine Society of Oncology, Inc.
 (Member since 2002)
 
 
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| PRESIDENT (2000 - 2002) Philippine Association of Academic Biochemists
 (Member since 1983)
 
 
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| FOUNDING PRESIDENT Molecular Oncology Society of the Philippines
 (October 1999)
 
 
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| MEMBER Philippine Association of Nutrition, Inc.
 (since August 17, 1998)
 
 
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| VICE-PRESIDENT FOR MEMBERSHIP Biotechnology Association of the Philippines, Inc.
 (June 1999 - present)
 
 
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| DIRECTOR Biotechnology Association of the Philippines, Inc.
 (June 19, 1998 - June 1999)
 
 
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| EXECUTIVE VICE PRESIDENT (1998 - 2000) Philippine Association of Academic Biochemists
 (Member since 1983)
 
 
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| LIFETIME MEMBER Philippine Society for Biochemistry and Molecular Biology, formerly Philippine Biochemical Society
 (member of the Federation of Asian and Oceanian Biochemists and Molecular Biologists and an adhering body to the International Union of Biochemistry)
 
 
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| LIFETIME MEMBER FEU-NRMF Alumni Society
 
 
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| LIFETIME MEMBER Philippine Association for the Advancement of Science
 
 
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| HONORARY MEMBER Professional Criminologist Association of the Philippines
 (February 1997)
 
 
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| MEMBER Radioisotope Society of the Philippines, Inc.
 (1990)
 
 
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| MEMBER Philippine Association of Laboratory Animal Science
 (1991)
 
 
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| MEMBER Philippine Society of Microbiologists
 
 
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| MEMBER Philippines Society of Parasitologists
 
 
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| PAST VICE-PRESIDENT Philippine Alliance of Medical Student Councils
 (1983 - 1984)
 
 
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| PAST VICE-PRESIDENT U.P. Zoological Society
 (1978 - 1979)
 
 
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| PAST PRESIDENT U.P. Association of Pure and Applied Science Societies
 (1978 - 1979)
 
 
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