Meet the team

Our team of dedicated equine veterinary surgeons and friendly support staff.

Rossdales Hertfordshire is a first opinion veterinary practice with four experienced veterinary surgeons dedicated to providing a professional, caring service to our clients and their horses and ponies.


Oliver Pynn




Ollie is the partner responsible for leading our team of vets at Rossdales Hertfordshire. He qualified from the University of Bristol in 2001 and subsequently worked in mixed practice for 2 years before joining Rossdales in 2003. He was awarded the RCVS Certificate in Equine Practice in 2008 and joined the partnership in 2009.

Ollie currently works as a stud vet, looking after the bloodstock of a number of our Thoroughbred clients. He also has a variety of sport horse clients and was the Team vet for the New Zealand 3-day Eventing Team between 2008 and 2014, including during the London 2012 Olympics when the team took the bronze medal.

Sarah Moore


Veterinary Surgeon

Sarah Moore

Sarah qualified from the Royal Veterinary College in 2009 and joined Rossdales Hertfordshire in 2013 after spending time in farm and equine practice in Norfolk and Northamptonshire. Since joining the practice she has developed a keen interest in stud farm work and in 2016 she was awarded the Certificate in Advanced Veterinary Practice in Equine Stud Medicine.  She sees a large number of our Thoroughbred and sports horse breeding clients in the Hertfordshire area and also has an interest in young stock and bloodstock sales work.

Outside of work she enjoys hunting and occasionally eventing her horse.  She is also a keen follower of Flat and National Hunt racing.

Kate Hannigan


Veterinary Surgeon

Kate Hannigan MRCVS

Kate qualified from Szent István University, Budapest in 2014. She subsequently completed a 15-month internship at Fethard Equine Hospital in Co Tipperary, Ireland, where she trained in all aspects of racehorse and sports horse poor performance work before joining Rossdales Hertfordshire in August 2015.

Kate is currently working towards her Certificate in Advanced Veterinary Practice (Orthopaedics) and while she enjoys all aspects of ambulatory equine work, she is particularly interested in lameness cases.

Kate has ridden from a young age and has competed to a high level in 3-day Eventing.  She is a keen follower of all equestrian disciplines, especially eventing and showjumping. In her free time Kate enjoys travelling and keeping fit.

Ria Chalder


Veterinary Surgeon

Ria Chalder

Ria gained a BSc in Biochemistry prior to undertaking her veterinary studies. She qualified with distinction from the University of Liverpool in 2015 and subsequently undertook an 18-month internship at Scone Equine Hospital, Australia, where she underwent intensive training in surgery, anaesthesia and critical care.  After a short spell working as a locum equine anaesthetist, she returned to the UK and began working for Rossdales Hertfordshire early in 2017.

Ria is currently working towards her Certificate in Advanced Veterinary Practice (Equine Medicine) and has a special interest in ophthalmology.  Passionate about evidence-based medicine, Ria was recently appointed as a Clinical Reviewer for the renowned Equine Veterinary Journal, and has won multiple awards and scholarships for research-based projects, in addition to presenting research in Australia. Ria is also an FEI Permitted Treating Veterinarian.

James Evans


Veterinary Surgeon


James joined the practice in September 2017.  He graduated from the Royal Veterinary College in 2011, where he then became part of the Equine Referral Hospital team as one of the Junior Clinical Training Scholars. He has subsequently worked in a number of equine and mixed practices in the Home Counties, working with a wide variety of horses and ponies across all disciplines, from the much-loved family pony to some of the top polo teams, event and competition horses.

James is an accomplished rider and has worked as a riding extra with the stunt team in various feature films. He is a keen cricketer and when time permits, he also enjoys playing golf, football and rugby.


Tara Morris

Office Manager


Tara joined our office team in September 2017.  She graduated from Harper Adams University in 2012 with a degree in Veterinary Nursing and Practice Management. She subsequently spent two years in a mixed practice before taking on a non-veterinary sales role covering the southern half of the UK. In 2015, she took on the role of technical advisor with a veterinary pharmaceutical company before joining Rossdales in September 2017.

In her spare time Tara enjoys riding and netball and she loves to bake. She also has what she describes as “an unruly pack of rescue dogs”, with a new dog arriving very soon.

Elaine Crockett

Office Administration and
Veterinary Technical Assistance

Elaine Crockett

Elaine joined the team in 2012 and is based in the office undertaking a variety of roles. Her previous roles in equine practice include a spell at Bushey Equine Hospital and 4 years at C P Harris & Associates, where she worked as a veterinary nurse and later an administrator.

Outside of work, Elaine enjoys competing her horses in affiliated showjumping competitions.

Sharon Machin

Office Administration and Accounts

Sharon Machin

Sharon joined the team in early 2013 having previously worked in finance and accounts. She is very much enjoying her current and varied role in equine practice.

Sharon enjoys spending time walking with her border terrier and is a member of the St Albans Dog Training Club.