Gerry graduated from Cambridge Veterinary School in 1997, after which he initially worked in first opinion practice. He entered specialist practice as a clinical oncologist in 2002. Gerry was awarded a Master of Science degree in clinical oncology by the Institute of Cancer Research at Birmingham University in 2003, having presented a thesis on the subject of canine anal sac tumours, a subject on which he is a world expert.

He became a Diplomate of the European College of Veterinary Internal Medicine and a European recognised Specialist in Oncology in 2010 and an RCVS recognised Specialist in Oncology in 2012.

Gerry has published scientific literature and lectured across the world on a range of cancer subjects including lymphoma, mast cell tumours, lung tumours, insulin-producing tumours and novell anti-cancer therapies; he chairs and participates in a number of European oncology research projects and has a particular interest in collaborative clinical research.