Dr. Mandelcorn completed his Bachelor of Science at the University of Western Ontario, where he graduated as a gold medalist. He received his medical degree with honours and subsequently completed his ophthalmology residency at the University of Toronto Department of Ophthalmology and Vision Sciences.

He had further specialized fellowship training in vitreoretinal surgery at the University of Toronto and also obtained a second fellowship in surgical retina and surgical posterior uveitis at the Bascom Palmer Eye Institute at the University of Miami, Florida.

Dr. Mandelcorn was awarded the J.S. Crawford Post-graduate Teaching Award in the Department of Ophthalmology, University of Toronto, in 2015. He was also honored with a Teaching Excellence Award in Postgraduate Education by the Wightman-Berris Academy, University of Toronto, University Health Network in 2014-5.

He was the first fellow to receive an award at the Bascom Palmer Eye Institute for Excellence in Teaching. He also received the Best Fellow Award in his first fellowship at the University of Toronto. He was the recipient of the Duncan Jamieson Memorial Prize and the Woywitka Cup for being the top resident at the University of Toronto for over five years. He was awarded the PAIRO Trust Residency Teaching Award for being the best resident teacher across all residency programs at the U of Toronto. Other residency awards include the Kensington Eye Institute Resident Cataract Surgery Award, the Dr. Sigmund Vaile Award, the Percy Hermant Fellowship In Ophthalmology, the Alumni Best Resident Research Day Award, the Dr. John Speakman Award, and the R. Gordon Kelly Award.

Dr. Mandelcorn is a Fellow of the Royal College of Surgeons and a Diplomate of the American Board of Ophthalmology. Dr. Mandelcorn is currently an attending surgeon at the Toronto Western Hospital, University Health Network. He is an Assistant Professor at the University of Toronto and an Associate Member of the Graduate Faculty Institute of Medical Science, University of Toronto. He is also the Fellowship Director for Vitreoretinal Surgery (UHN & Sunnybrook sites) at the University of Toronto.