Dr McLellan graduated in 1990 from the University of Glasgow Veterinary School. After a few years spent working in general veterinary practice, she gained her first qualification in veterinary ophthalmology in 1993. She then completed a residency and PhD at the Royal Veterinary College, University of London. Dr McLellan moved to the USA in 2000, and has since held faculty positions at UC Davis in California; Iowa State University, and the University of Wisconsin-Madison. Currently, Dr McLellan holds positions in both the School of Medicine and Public Health and the School of Veterinary Medicine at UW-Madison. Dr McLellan is board certified in veterinary ophthalmology by the Royal College of Veterinary Surgeons in the UK, the European College of Veterinary Ophthalmologists and the American College of Veterinary Ophthalmologists. She serves on the ECVO executive committee as Vice President. Her research interests include the glaucomas in all species, including humans!