Doctor Materin completed his medical training at Buenos Aires University School of Medicine (Argentina) in 1983. He then specialized in Ophthalmology at Santa Lucia Ophthalmologic Hospital in Buenos Aires, Argentina. Dr. Materin did a clinical fellowship in Retina at Consultores Oftalmologicos in Buenos Aires, joining the team afterwards. He was director of the Ophthalmology Department at the Police Hospital in Buenos Aires. Dr. Materin completed a fellowship in Ocular Oncology here on the Oncology Service at Wills Eye Hospital in 1999. He is an International Member of the American Academy of Ophthalmology since 1992. Dr. Materin was lead instructor of the Ocular Oncology topic for the Vitreous, Uvea and Retina Course at the Austral University in Buenos Aires. During his career, Dr. Materin was a speaker in different countries including: Argentina, The United States, Holland, Uruguay, Ecuador, France, Puerto Rico and others. Dr. Materin joined the Oncology Service as a staff physician in January 2002. He is the Director of Diagnostic Studies on the Oncology Service.

Doctor Marr completed his medical training at Temple University School of Medicine and then specialized in Ophthalmology at The New York Eye and Ear Infirmary. He was involved in research at Harvard University and Massachusetts General Hospital for three years. He has been in private practice in the Philadelphia area for two years before returning in 2001 to the Oncology Service at Wills Eye Hospital for his two year ocular oncology fellowship. He has published chapters in several text books such as Duanes Ophthalmology, Clinical Pearls of Ophthalmology as well as contributions to major ophthalmic journals. Dr. Marr also contributes to the teaching and lecturing to the Wills Eye Hospital residents. He is an accomplished surgeon with compassion and dedication for his patients and work as well as an active member of the American Medical Association and a Board certified fellow of the American Academy of Ophthalmology.

Doctor Mashayekhi completed his Medical and Ophthalmology training at Pahlavi University of Medical Sciences (Shiraz, Iran). He did a Retina Fellowship in 1992 at Beheshti University of Medical Sciences (Tehran, Iran) where he continued to practice for several years as Assistant Professor of Ophthalmology and served as a member of the editorial board of Bina Journal of Ophthalmology and was a co-member of the scientific committee of the Center for Eye Research. During 2001-2002, Dr. Mashayekhi completed his fellowship in Ocular Oncology here at Wills Eye Hospital. He is currently a Staff Physician and Researcher on the Oncology Service working extensively in the field of ocular tumors. He is an International Member of the American Academy of Ophthalmology and has been co-instructor of several courses at the annual meetings of this Academy. Dr. Mashayekhi has written a text book on diseases of the retina and has authored or co-authored multiple scientific reports that have been published in major peer reviewed ophthalmology journals. The results of his continuing research have been presented at international ophthalmology congresses and meetings.