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IZVG Avian and Exotic Clinic - Our Staff

A division of the International Zoo Veterinary Group

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Johanna Storm MRCVS - Veterinarian

Image 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, where she cared for over 3000 parrots, dolphins and chimpanzees.

With over 28 years spent specialising in avian and reptile medicine and surgery, Johanna now runs our first opinion and referrals clinic in Hipperholme.




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

Image of Andrew Greenwood and Hyacinth Macaw

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 the supervising partner for the clinic and runs occasional clinics, primarily for the surgical sexing of birds. If you require this service, please telephone the office and we will contact you with details of the next session.

Andrew is based in Yorkshire.



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, and an RCVS Recognised Specialist in Veterinary Pathology (Zoo and Wildlife). Mark is the current President of the British Veterinary Zoological Society, was the Founder Secretary of the British Society of Veterinary Pathology. He 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 and a RCVS Recognised Specialist in Veterinary Pathology (Zoo and Wildlife). 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. Daniela is a pathology advisor to the EEHV advisory group . She speaks and publishes regularly in the field of zoo and wildlife pathology.


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



International Zoo Veterinary Group is a trading name of IZVG LLP, a limited liability partnership no. OC361054, registered England

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