Ophthalmologist in private practice: Centro Oftalmológico Gustavo Tamayo Fernández S. A. Bogotá, Colombia.
Partner and Member of the Board of a Private Group: Sociedad de Cirugía Ocular. Bogotá, Colombia.
Founder member of a private group: EXILASER S.A. Bogotá, Colombia
International and USA certified Physician Trainer for VISX Inc. Santa Clara, CA, USA.
AMO Advisory Board Member. Santa Clara, CA, USA.
Scientific Advisor and Lecturer of MORIA Inc, Paris, France
Director of a Private Corporation, DE LA VISIÓN: DECENTERED EXCIMER LASER ABLATIONS Bogotá. Colombia
Member of the Editorial Board OCULAR SURGERY NEWS –International Edition- Slack Inc. Mass. USA.
Specialist Reviewer of the JOURNAL OF REFRACTIVE SURGERY. Slack Inc. Mass. USA.
Specialist Reviewer of the JOURNAL OF CATARACT AND REFRACTIVE SURGERY. Elsevier Inc, California USA.
Founder, member and Scientific Director of a refractive surgery institute: ARUBA LASER REFRACTIVE INSTITUTE. Oranjestad. Aruba, Dutch Caribbean Islands
Founder, member and President of a refractive surgery institute: BOGOTÁ LÁSER REFRACTIVE INSTITUTE. Bogotá, Colombia
Founder, member and Scientific Director of a private clinic: CORTA ESTANCIA CANCÚN EXCIMER LASER SURGERY Cancún, México.
Internacional Medical Monitor for AMO-VISX Inc, California. USA.
Member of the Advisory Board of the Italian Society of Refractive Surgery Brescia, Italy.
Member of the Advisory Board of the 20/10 Perfect Vision Company. Heidelberg, Germany.
Member of the Advisory Panel of Corneal Onlays project from Ocular Sciences Inc. (OSI) and Cooper Vision Inc, California, USA.
Member and Latin-American Representative of the International Council from the International Society of Refractive Surgery (ISRS) and American Academy of Ophthalmology (AAO).
Appointed as member of the Board of the American Academy of Ophthalmology/Section of Refractive Surgery.
Appointed as sub director of the 2008 Subspecialty Day of Refractive Surgery of the American Academy of Ophthalmology Meeting.
Appointed as Director of the 2009 Subspecialty Day of Refractive Surgery of the American Academy of Ophthalmology Meeting.
Honorary Professor of the Universidad Nacional de Colombia, Ophthalmology Department.