Our Veterinarians

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Jeffrey Stupine, VMD

Medical Director & Veterinarian

Dr. Jeffrey Stupine graduated from George Washington University in 1999, earning a degree in Economics. After a successful career as an equity trader, he returned to school to pursue his true passion of Veterinary Medicine. He received his V.M.D in 2010 from the University of Pennsylvania School of Veterinary Medicine and has worked in both private practice and shelter medicine since. His veterinary interests include radiology, cardiology, and parvovirus. On April 1, 2017, Dr. Stupine was appointed the Medical Director for all World of Animals Hospitals. Dr. Stupine and his wife are proud pet parents to their cat, Harry Potter.

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Tanya Kameneva, VMD


Dr. Kameneva started her professional Veterinary career as a certified anesthesia technician at the University of Pennsylvania’s Veterinary Hospital. She went onto complete her education and received her Veterinary Medical Doctorate from the University of Pennsylvania School of Veterinary Medicine, Philadelphia PA. Following was her Emergency and Internal Medicine Internship Training – Angel Memorial, Boston MA, and Surgical Specialty Internship Training – Center for Animal Referral and Emergency Services, Oxford Valley PA. She lives with a Siamese cat named Sushi and a mixed breed dog named Ace.

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Tamara Borland, VMD


Dr. Tamara Borland joined the World of Animals team in 2017. Her passion for veterinary medicine began at the early age of 12 volunteering for a local veterinary hospital. She earned her undergraduate degree at Boston College then went on to attend the University of Pennsylvania School of Veterinary Medicine where she earned her V.M.D. in 2007. After graduation, she headed west to the San Francisco bay area enhancing her knowledge and skills set. She feels honored to be a part of caring for pets and the humans they love, and focuses on delivering excellent patient care with understanding and compassion. Her special interests are dentistry, dermatology, and surgery. In her off time, she enjoys indulging her amateur foodie title exploring new restaurants, going on hikes with her dog Picxie, and feeding her love for music, art, and literature.

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Steven Radbill, VMD


Steven Radbill VMD is a graduate of the University of Pennsylvania School of Veterinary Medicine. Dr. Radbill is newly associated with World of Animals after successfully owning and operating Radbill Animal Hospital in Center City Philadelphia and in Northeast Philadelphia for over 40 years. Additionally, Dr. Radbill served on the Pennsylvania Board of Veterinary Medicine for 8 years. He is the author of the book Questions and Answers Dog Owners Ask Their Vet and was the Veterinary Contributor to Evening Magazine on ABC.

Dr. Radbill feels privileged to be part of the World of Animals team of Veterinarians and Staff who are dedicated to caring for our four-legged friends. His special interests are Laser Surgery, Dermatology, and Geriatric Medicine. In his spare time, Dr. Radbill enjoys biking, reading, gardening, and spending time with his family.

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Casey McMahon, VMD


Dr. Casey McMahon earned a degree in Pathobiology at the University of Connecticut. She then attended the University of Pennsylvania where she received her Veterinary Medical Degree. After graduating she moved to Boston where she worked with dogs, cats, rabbits, guinea pigs and chickens. Dr. McMahon and her cat Bill are excited to be back in Philadelphia and be a part of the World of Animals family.

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Rachael Nelson, VMD


Dr. Nelson was raised in Cherry Hill, NJ. She attended the University of Wisconsin-Madison, where she received her bachelors in Zoology and Psychology. She then went on to receive her Veterinary Medical Degree from the University of Pennsylvania and completed a one-year specialty internship in Emergency and Critical Care at the Veterinary Specialty and Emergency Center (VSEC). In her spare time, she enjoys doing yoga and reading. Dr. Nelson lives in Center City with her husband and their Maltese, Sheldon.

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Marissa Burns, DVM


Dr. Marissa Burns’ devotion to veterinary medicine began at the early age of 5 years. She took her passion of caring for her grandmother’s boxers and later started working in the field as an animal care attendant. She earned her undergraduate degree at Mansfield University in biology then went on to attend school at Iowa State University College of Veterinary Medicine where she earned her D.V.M. in 2014. She has since spent her time devoted to small animal wellness and emergency medicine. Her veterinary interests are surgery, dentistry, urgent care, and pocket pets. In her free time, she can be found with her husband, daughter, and two dogs Jaxon and Etta.


Josiah Hendler, VMD


Dr. Josiah Hendler graduated from Skidmore College in 2001, earning a degree in Music and Business. After working in several recording studios and record labels in New York City, he founded his own recording studio in the heart of New York City’s Times Square. With 15+ successful years in the music business, he turned his attention towards veterinary medicine – a lifelong passion. Dr. Hendler received his V.M.D. in 2022 from the University of Pennsylvania and is devoted to empowering owners to care for their loved ones. He lives in South Philly with his family: wife Allison, son Noah, and dog Lola.

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