Animal Specialty Center


  • Hospital Director

    Katherine Warren

    Katherine Warren has been with VCA Animal Specialty Center since 2010. That same year she graduated with honors from Mercy College with a Bachelor of Science Degree, specializing in pre-veterinary medicine. She started as an LVT in Neurology and ICU, but soon realized that Oncology and ER were where she wanted to focus her efforts and expand her expertise. After going through chemo with her own pets and eventually losing 5 pets to cancer, she felt she had something extra special to give to the cancer patients and their families and decided to make a home in Oncology.

    Originally planning on using her tech role as a stepping stone to becoming a veterinarian, Kathy, through working closely with Oncology patients and their families, began to feel the impact that she was having in the department and began to embrace the role. During this time she was promoted to Oncology Supervisor then Technician Supervisor, both roles where she could help her fellow technicians learn the vital skills that she had developed along the way. Always one to step up to a challenge, Kathy has now taken on the role of Hospital Director, where she hopes to continue to help others and to lead by example.

    In Katherine’s spare time she shares her home with her 5 cats and 1 dog, each of which has their own medical challenges. Kathy has an adventurous spirit as well and enjoys extreme sports such as bungie jumping and skydiving, with her most recent adventure taking her zip-lining on the tallest and longest line at Hunter Mountain.

  • Hospital Administrator

    Marion Kastner

    Marion Kastner is the Hospital Administrator with Animal Specialty Center in Yonkers, New York. She joined ASC in 2007 to help plan and set up ASC’s accounting systems when the hospital was still in its pre-opening construction phase. Almost 10 years later and it is hard to imagine the hospital without her guidance and endless support, as she has become the backbone of our facility and culture. Not only does Marion work closely with the management team to achieve the hospital's mission but also with employees, clients, vendors and other hospitals, among others.

    After receiving her Bachelors of Business Administration in Accounting and Information Systems at Pace University in Pleasantville, NY, Marion worked in accounting in both the public and private sectors. This experience, coupled with time in retail early on, has greatly contributed to her ability to work efficiently in a broad range of industries.

    While not at work, Marion enjoys spending time with her family and friends, singing at karaoke bars and working on her family tree. 

  • Referral Manager

    Joe Chiapperini


       Joseph began his career at the Animal Specialty Center back in 2010 as a Client Care Specialist. He had planned on pursuing a career in education but quickly fell in love with the hospital and the veterinary environment. In 2012 Joseph joined the Surgery team as the departmental coordinator and found a niche where he could combine his people skills with his passion for helping animals. Working closely with Dr. Jennifer Bonczynski and her amazing surgical team, Joseph learned how to manage an extremely busy specialty department while expanding his knowledge of the inner workings of a veterinary office. While he loved his time working with the Surgery team, when the position of referral manager became available Joseph jumped at the opportunity to grow and challenge himself once again. As the liaison between the Animal Specialty Center and the amazing veterinary community of the greater tri-state area, Joseph has the opportunity to continue to assist the wonderful people and animals of New York and beyond.

    Interests: Joseph has many interests outside of the veterinary world including but not limited to writing, reading, jogging with his husky, Brodie, playing and discovering new music and expanding his culinary expertise.

    Personal: Joe always wanted to write a novel or a screenplay and plans on making an independent film at some point.


General Practice

We have over 600 animal hospitals in 41 states and 4 Canadian provinces that are staffed by more than 3,000 fully-qualified, dedicated and compassionate veterinarians, with more than 400 being board-certified specialists.

The nationwide VCA family of general practice hospitals give your pet the very best in medical care, providing a full range of general medical and surgical services as well as specialized treatments such as wellness, spay/neuter, advanced diagnostic services (MRI/CT Scan), internal medicine, oncology, ophthalmology, dermatology, cardiology, neurology, boarding, and grooming. Services may vary by location.

Our family of pet hospitals stands out by delivering the greatest resources in order provide the highest quality care available for your pets. By maintaining the highest standards of pet health care available anywhere, we emphasize prevention as well as healing. We provide continuing education programs to our doctors and staff and promote the open exchange of professional knowledge and expertise. And finally, we have established a consistent program of procedures and techniques, proven to be the most effective in keeping pets healthy.

Find a VCA General Care Animal Hospital near you:


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Emergency Care


TEL: 914-457-4000

Click here for directions to our location.

Animal Specialty Center is a fully-equipped 24/7/365 emergency hospital serving communities in and surrounding lower Westchester. If you suspect your pet may be having a medical crisis, we have a staff of top veterinarians, technicians and client care specialists prepared to handle all pet medical emergencies.

Our Emergency and Critical Care units can assist in all of the following situations requiring immediate medical attention: Auto accidents, traumatic injuries (fractures, bites, burns, lacerations, wounds), respiratory emergencies (choking, difficulty breathing), vomiting, diarrhea, difficulty urinating/defecating, shock, loss of consciousness, dizziness, staggering, tremors, seizures, paralysis, toxic reactions, poison ingestion, labor and delivery problems, blood in urine or feces, swollen, hard, painful abdomen, heatstroke.