Trained in dermatology across Adelaide, Darwin, and Sydney, Dr De Rosa received the prestigious Ken Paver Medal for Excellence, achieving the highest score in the medical dermatology fellowship examinations.

He initially practiced as a general practitioner and later pursued his interest in skin disease, undertaking a Master’s in Medicine from the University of New South Wales, where his research focused on skin cancer in solid organ transplant recipients. He is a published author in medical journals and textbooks. Dr De Rosa works at Adelaide Dermatology Associates in Henley Beach and Dermatology SA in both Dulwich and Mount Barker.