[6] Harsh Kumar graduated in medicine (MBBS) from the All India Institute of Medical Sciences, New Delhi, secured his master's degree (MD) in ophthalmology from Dr. Rajendra Prasad Centre for Ophthalmic Sciences, both with gold medals[5] and did senior residency at R. P. Centre to pass out with the best senior resident award.

[3] He joined his alma mater as a member of faculty and served the institution as an additional professor of the glaucoma unit.

[3][5] He works at Centre for Sight, Delhi as the director of Glaucoma unit[3] and at the Apollo Hospital, Indraprastha, as a consultant surgeon.

[3][5] He is known to have done extensive research on glaucoma and has published three books and 66 papers, besides contributing chapters to several textbooks on the subject.

He is also involved in continuous medical education by conducting classes and workshops on the subject[8][9][10] and has mentored twenty five students in their doctoral researches.