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"An animal's eyes have the power to speak a great language" ~Martin Buber

Petchester's Veterinarians--"An Eye of a Different Color"


We are proud to tout that our founding veterinarians, Dr. Lester Sills and Dr. Zsach Ben Adi, have not only combined clinical experience of over five decades, but they also have been voted one of the "topVets" in Westchester County, New York and featured in Westchester Magazine three years in a row---2011, 2012, 2013. "topVets" was started with the intent to identify the best veterinarians and specialists in the country and is the only list of its kind chosen by the veterinary professionals themselves. Veterinarians must be voted in strictly by their peers, and virtually every veterinarian is given an opportunity to participate. And because listings are peer chosen and cannot be purchased, inclusion in topVets is considered to be a distinct honor.  Also, Petchester was voted Best Veterinary Center by Westchester Magazine in 2023. Another reason that you should be confident that your pet’s care at Petchester Veterinary is in the best of hands.

Our veterinarians are well versed in small animal and exotic medicine and surgery and receive ongoing continuing education to keep them updated on the latest medical concepts and techniques. They are also active in veterinary professional organizations which keeps them further connected to the trends in veterinary medicine. Our veterinarians also believe in giving back to the community and do this by offering their veterinary services to various rescue groups, animal shelters, and nature centers. They have also been available in disaster situations like treating the search and rescue dogs at the World Trade Center site in the aftermath of 9-11 and helping to treat smoke inhalation in animals that were involved in a local, residential, apartment building fire. Our veterinarians are also committed to educating students, clients, and the public and visit schools to give presentations on animal health. They also invite groups to tour the hospital and offer volunteer opportunities for senior internships and school projects. But, most importantly, our veterinarians love animals. That is why they chose this profession. They are committed to ensuring the health, welfare, and well-being of all animals.

Lester Sills, DVM

Veterinarian and Co-founder of Petchester Veterinary


Dr. Lester Sills has been practicing veterinary medicine for 35 years. His Doctorate in Veterinary Medicine (DVM) was obtained in 1988 from The Ohio State University College of Veterinary Medicine. He began practicing small animal medicine in South Windsor, Connecticut for four years and practiced in Scarsdale, New York from 1992-2013. He is one of the co-founders of Petchester Veterinary which opened its doors in December of 2013. His many years as a seasoned clinician and surgeon culminated in his being voted one of the Top Veterinarians ("topVets") in Small Animal Medicine and Surgery in Westchester County and featured in Westchester Magazine in 2011, 2012, and 2013. Petchester was also voted the Best Veterinary Center by Westchester Magazine in 2023. He has served as a volunteer, consulting veterinarian and board member for the Greenburgh Nature Center (GNC) treating many different exotic animals for over 20 years. He received the GNC’s Volunteer of the Year Award in 2001. He has a special interest in avian medicine and treats many other exotic pets in addition to birds such as reptiles, rabbits, ferrets, and rodents. He is also well known for his ever-present willingness to accept and treat injured wildlife. Dr. Sills was one of a group of veterinarians that helped treat the rescue dogs at the site of the 9-11 World Trade Center disaster. He has also served on the Board of the Westchester-Rockland Veterinary Medical Association (WRVMA) for twenty five years and has been chairman of the Ethics Committee from1999-2022. He is a member of the American Veterinary Medical Association (AVMA) and Association of Avian Veterinarians (AAV). He also continues to volunteer for Bully Baby Rescue and Pet Rescue for their spay and neuter programs. Dr. Sills currently resides in Westchester County, New York with his veterinarian wife, two children, three rescued dogs, and his 38 year old parrot. In his spare time, he enjoys yoga, hiking, biking, and walking his dogs.


Zsach Ben Adi, DVM

Veterinarian and Co-founder of Petchester Veterinary


Dr. Zsach Ben Adi was born in Jerusalem, Israel and went to veterinary school in Germany at the Justus Liebig University graduating in 1997. He completed a one year internship and began practicing in Rhinebeck, New York for his first four years. He worked in a small animal clinic in Scarsdale, New York for nine years. Dr. Ben Adi is a co-founder of Petchester Veterinary which opened in December, 2013. He was featured in Westchester Magazine as one of the Top Veterinarians ("topVets") in all of Westchester County, NY in 2011, 2012, and 2013. Petcheter was voted Best Veterinary Center by Westchester Magazine in 2023. He is a proficient clinician and surgeon and has extensive training in veterinary ultrasonography. Dr. Ben Adi is a member of the Westchester-Rockland Veterinary Medical Association (WRVMA) and American Veterinary Medical Association (AVMA). He also continues to volunteer his time and expertise to the spay and neuter programs of New York’s Pet Rescue. Prior to his veterinary medical career, Dr. Ben Adi served as a paratrooper in the Israeli Army. After his military service, he traveled through South America for an entire year. It was there, in the Galapagos Islands, where he met his wife who is from Langenfeld, Germany. Dr. Ben Adi is fluent in many languages including English, Hebrew, and German and has some basic knowledge of Spanish. Dr. Ben Adi likes to hike and bike as well as has been a coach of a boys’ travel soccer team. Dr. Ben Adi has two children, two dogs, and two cats, and lives in Garrison, New York.


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Alexis Carozza, DVM

Associate Veterinarian


Cassie Ring is thrilled to join the skilled and compassionate team at Petchester Veterinary. As a Westchester County native, she is happy to be returning home after spending time in North Carolina for her undergraduate degree, St. Kitts for her veterinary degree, and Texas for her clinical studies. She received her Bachelors from Wake Forest University in 2014, where she majored in Biology and minored in Chemistry and Art History. After working in a veterinary practice following graduation, she went on to receive her DVM from Ross University School of Veterinary Medicine in St. Kitts in 2019. She finally returned to the States to complete her clinical studies at Texas A&M College of Veterinary Medicine. While in veterinary school, she enjoyed spending time outside of the classroom volunteering with several rescue organizations, participating in dog-training classes, and fostering multiple rescued dogs and cats. Dr. Ring is a member of the American Veterinary Medical Association (AVMA) and Westchester Rockland Veterinary Medical Association (WRVMA). She is also a Category I USDA Accredited Veterinarian in the state of New York. She has a mixed breed dog from the island of St. Kitts named Stella and a grey cat named Milo. In her spare time she enjoys the company of friends and family, spending time with her pets, running, reading, and playing the cello.

Cassie Ring, DVM

Associate Veterinarian


Alexis Carozza grew up in Westchester NY and has been a part of the Petchester team since she was in high school, previously as a veterinary assistant. She is so excited to return and continue her journey as a veterinarian where her career in veterinary medicine first began. Dr. Carozza received her bachelor’s degree in Pre-Veterinary Medicine and Animal Biosciences from the University of Delaware. She then went on to receive her DVM from Ross University School of Veterinary Medicine in St. Kitts & Nevis and returned to the US to complete her clinical and surgical training at the University of Florida. While attending veterinary school, Dr. Carozza was passionate about getting involved in the local community, volunteering with multiple organizations to provide low cost veterinary care to animals in need. Special veterinary interests include; client education, nutrition, oncology and surgery. Outside of work she enjoys spending time outdoors, painting, and traveling with her significant other and 2 pets. She has a cat named Riley who she adopted while attending school in St. Kitts and Nevis and a Golden Retriever named Sadie who she adopted while completing her clinical year in Florida.

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