Mark graduated with a BVSc (Hons) from the University of Sydney in 2003. Following graduation he worked mainly in shelter medicine for 10 years, before returning to the University of Sydney to undertake a PhD investigating feline retroviral diseases. Upon completion of his PhD in 2016, Mark moved to the University of Glasgow to undertake postdoctoral research in FIV and FeLV. For the past couple of years Mark has lectured in veterinary microbiology at the University of Sydney and maintained an active research profile, publishing articles on both FIV and FeLV infection. Mark has volunteered for veterinary programs in Papua New Guinea, Thailand, Indonesia and India, and also co-founded Pets in the Park in Australia, a charity dedicated to providing free veterinary care to pets owned by the homeless.