- 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.