He underwent fellowship training in oculoplastics at Moorfields Eye Hospital from 1989-1991 and for the past 25 years has had a sub-specialty practice mainly involving eyelid surgery. Since 2000 he has run an oculoplastic fellowship program in Auckland for overseas ophthalmologists to train in oculoplastic surgery. Dr Rosser has been the orbital/plastics section editor for Clinical and Experimental Ophthalmology and is a past president of the Australia and New Zealand Oculoplastic Society.