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Image of Andrew Greenwood and dolphin

Andrew Greenwood MA, VetMB, FSB, CBiol, DipECZM, FRCVS - Partner

Andrew joined David Taylor as a partner in 1973 and, in 1976, they together formed the International Zoo Veterinary Group. An internationally recognised expert in avian diseases and marine mammal care, he is a Specialist in Zoo and Wildlife Medicine of the Royal College of Veterinary Surgeons.

Currently, Andrew acts as veterinary advisor to various conservation projects in Mauritius, and to the World Parrot Trust. He is a Council member of Twycross Zoo and has served on the Council of the Durrell Wildlife Conservation Trust and the Zoological Society of London. Andrew is a Trustee of the Wildlife Information Network and the World Parrot Trust and is a member of the government-appointed Zoos Forum.

Andrew is based in Yorkshire, in the North of England.

Image of John Lewis and Amur Tiger

John Lewis MA, VetMB, PhD, MRCVS - Partner

John received his doctorate for work in human oncology and joined the practice in 1985. With wide experience in feline & primate medicine, advanced techniques of anaesthesia, and wildlife medicine, he is recognised by the Royal College of Veterinary Surgeons as a Specialist in Zoo and Wildlife Medicine, and was appointed to Part 1 of Secretary of State's list of zoo inspectors in July 1996. John is a veterinary advisor to the Tiger and Amur Leopard EEP’s and the EAZA Felid TAG, and a member of the IUCN Cat Specialist Group. Being a founder member and veterinary director of Wildlife Vets International, John is actively involved in several cat field conservation projects. Based in Kent, John is a visiting lecturer at the Durrell Institute for Conservation Ecology.

Sue Thornton BSc, BVetMed, MRCVS - PartnerImage of Sue Thornton and penguin at Scarborough Sealife Centre

Sue joined the practice in May 2000, having previously worked as Veterinary Officer at London Zoo and the Marine Mammal Center, California. She is a government appointed Zoo Inspector. Sue became a partner in the practice in 2003. Sue was the Senior Vice President of BVZS in 2007/2008, and is a veterinary advisor to the EAZA Amphibian and Reptile TAG and the UK HerpTAG.

In addition to her experience with a broad range of species, Sue has a special interest in fish and lower vertebrates, and is consultant vet to a number of aquaria.

Sue is based in Hertfordshire, in the South of England.

Johanna Storm MRCVS - VeterinarianImage of Johanna Storm and african grey parrot

A graduate of the Veterinary School of Giessen University, Germany, Johanna was formerly Technical Director of the Madrid Zoo and resident vet at Loro Parque, Tenerife.

With over 28 years spent specialising in avian and reptile medicine, Johanna now runs our first opinion and referrals exotic pet clinic in Hipperholme, near Halifax, Yorkshire where she also sees animals from some of our zoological collections.

Tania Pawlowsky Monreal MRCVS- VeterinarianImage of Tania Monreal with Ibis

Tania graduated from Universidad Autonoma of Barcelona in February 1998, and spent 4 years travelling the World, working in zoos and conservation projects in Greece, Finland, Argentina, Mexico, the US, and with a whale Photo-ID and whale watching project in Norway. In 2000, she started working as a vet for the Aspro-Ocio group, becoming head of the Veterinary Department by 2002 and Technical Director by 2006. For a few years, Tania divided her time between working for Barcelona Zoo as Curator for Aquatic Animals, and working for IZVG. Since 2015 she has worked full time with IZVG. Tania is also Chair of the European Association for Aquatic Mammals Veterinary and Accreditation Committee, as well as an inspector for the Association. She is a member of EAMM, IAAAM, EAZVW and BVA.

Tania is based in Barcelona, Spain.

Steve Philp BSc(Hons) MA VetMB GP Cert (Ex AP) MRCVS- Veterinarian

Image of Steve with Tiger

Steve joined the practice in July 2011. Before he graduated from Cambridge University in 2005, he completed a course in Chemical and Mass Capture in South Africa and spent some time touring the country working with a Game Capture Team. Since qualifying, he has spent 6 years in mixed practice in the South West, seeing first opinion exotics cases. In 2007 he became the approved Vet for Newquay Zoo and provided their veterinary cover for more than 3 years whilst also providing services for Cornish Birds of Prey, Colliford Lake Park and the RSPCA. During that time he also assisted with some of IZVG’s work at Blue Reef Aquarium Newquay.

Steve is based in Cambridge, in the South of England.

Mark Stidworthy MA VetMB PhD MRCPath MRCVS - Pathologist

Image of Mark Stidworthy

Mark has been responsible for the pathology division of IZVG since 2003. He has pathology residency training and diagnostic experience from Liverpool and Cambridge Veterinary Schools, and completed his PhD, studying repair in the central nervous system, at Cambridge. Mark is a Fellow of the Royal College of Pathologists, in the specialty of veterinary pathology. Mark was the founder Secretary of the British Society of Veterinary Pathology, is an active member and current President of the British Veterinary Zoological Society, and speaks and publishes regularly in the field of zoo and wildlife pathology.

Daniela Denk Dr med vet DiplECVP MRCVS - Pathologist

Image of Daniela Denk

Daniela joined the practice in March 2011. After graduating from the Veterinary School of Munich University, Germany in 2006, she began her pathology training and wrote her thesis on dermatopathological alterations in canine atopic dermatitis. Daniela completed her pathology residency at Liverpool University and is a Diplomate of the European College of Veterinary Pathologists. In addition to her focus on zoo- and wildlife pathology, she maintains her interests in neuropathology and dermatology. She is an active member of the European Society of Veterinary Pathologists, and the International Society of Veterinary Dermatopathologists, and is a pathology advisor to the EEHV advisory group.

The laboratory facilities of IZVG Pathology are located near Leeds in Yorkshire. Graduate biologist Neil Wagstaffe, who has worked part-time for the practice since January 2007, provides technical support for our two pathologists.

E-mail the pathology department:pathologists@izvg.co.uk


Olivia Walter BSc (Hons) MSc- Researcher

Olivia got her first degree at University of Edinburgh before starting work as a small mammal keeper at ZSL London Zoo and then at Sharjah Breeding Centre for Endangered Arabian Wildlife, before returning to ZSL to work as a zoo population manager. Prior to starting at IZVG, Olivia worked for the British and Irish Association of Zoos and Aquariums helping members exceed standards set by the Zoo Licensing Act, representing zoos to the public, media and policy decision makers. While at BIAZA, Olivia obtained her MSc in Conservation Biology from the Durrell Institute for Conservation and Ecology.

Olivia runs conservation charity Wildlife Vets International, as well as carrying out research work for clients.


Elizabeth Smith - Office Manager

Liz joined the practice in 1994, and is the Office Manager. She is responsible for the accounts, and the legal and financial side of the office as well as personnel management.

Administration Team

Claire Kelly, Tish Saxton, Lynne Mason and Bridget Ward run our busy head office, taking on secretarial and administration duties, ordering and distributing medical supplies and zoovet products, and managing the exotic pets clinic. They ensure that the whole practice works smoothly.

IZVG supports Wildlife Vets International registered charity no. 1109670
Veterinary support for conservation worldwide
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