[1] In 2002, together with Reza Dana and Ying Liu, he was the first to discover the presence of and characterize resident antigen-presenting cells in the central cornea.

[2][3][4][5] Hamrah is currently Professor and Vice Chair of Research and Academic Programs, co-director of Cornea Service, Director of the Center for Translational Ocular Immunology, Tufts Medical Center, Departments of Ophthalmology, Tufts University.

[1] He was a faculty member in the laboratory of Ulrich von Andrian at Harvard's Immune Disease Institute from 2008 to 2012.

He serves on numerous additional editorial boards and is a peer reviewer for over 45 ophthalmology, immunology, and transplantation journals.

He is an instructor at the American Academy of Ophthalmology and recently served as Chair of the ARVO Members-in-Training Committee.