 Marcos Celestino's work focuses upon the development of diagnostic and correctional instruments in ophthalmology.From 1993 to 1996, Celestino had a predoctoral fellowship in the Department of Vision and Physiological Optics at the Institute of Optics of the CSIC in Madrid, Spain.Celestino spent three years, from 1997 to 2000, as a postdoctoral researcher in Schepens Eye Research Institute of the Harvard University Medical School in Boston.