Meet Our Team

We’re there during the tough times.
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Who are we?

Private Veterinary Specialties L.L.C provides on-site medical oncology services at 5 different locations for veterinarians and their clients throughout central New Jersey. This unique approach allows some pet owners to stay with their primary veterinarian’s office while their pet is receiving cancer care or be seen at one of our convenient locations.

We provide veterinary cancer consultations, diagnostic procedures, chemotherapy, and immunotherapy. Full lab services include blood work, flow cytometry, cytology, and histology. Essentially we bring the specialists to you.

Our Experienced Team Can Help

Founder of PVS, Dr. M.J. Hamilton has assembled a talented team of professionals for the practice. Private Veterinary Specialties specializes in pet oncology, however, our team has cared for dogs, cats, and various animal species including those in zoo habitats.

In fact, our expertise extends beyond our area of specialty. So, do not be deterred if your pet is not included on our list. Schedule a consultation with PVS to find out how we can help!

M.J. Hamilton, DVM, DACVIM(O)

M.J. Hamilton, DVM, DACVIM(O)

Veterinarian / Owner

Dr. Hamilton has worked in veterinary medicine his entire life, starting as kennel help at the age of 14. After completing his undergraduate degree in psychology he stayed at Colorado State University to complete his doctorate of veterinary medicine. Dr. Hamilton spent two years in general practice in Las Vegas then went on to start his oncology residency at Michigan State University. As a board-certified veterinary oncologist, Dr. Hamilton has been commissioned to start multiple oncology departments in the northeast, participate in clinical trials and is asked lectures frequently. Dr.Hamilton has been providing oncology care in NJ since 2011 seeing patients most commonly from Hunterdon, Somerset, Warren and Union counties. Dr.H deeply enjoys the bettering the lives of oncology patients and working with their owners to ensure the best quality of life possible. This passion motivated Dr. Hamilton to bring oncology specialty care to the general practice in 2017, allowing pet owners, veterinarians and specialists to work together in one setting. When not at work, Dr. Hamilton enjoys hobby farming and tending to all his critters.


Darlene has worked in the Veterinary Field as a technician for 14 years in a general practice located in Sussex County NJ. Her experience is in assisting with surgeries, dental and xrays. She especially enjoys interacting with clients and their pets. Darlene believes the client and their pet need to be treated as a team in all aspects of Veterinary Medicine. Darlene has been happily married for 30 years to her husband, Chip. Together they have four children and one grandson. She currently has 2 horses, 4 cats and 1 dog. Some of her hobbies include tending to her horses and knitting small blankets for Ten Lives Cat rescue of Rhode Island.



Born and raised in East Stroudsburg, PA, Ashley has always had a love for animals which led her into the veterinary field. She has worked as a technician for 10 years at a general practice in Blairstown New Jersey, where she has had experience in everything from receptionist work to assisting in surgery, taking CT scans, radiographs and performing dentistries. Ashley has always believed that the animal’s health and well being comes above all! What she enjoys most in this field is being able to help the animals and and try to make a difference but when not possible just being that support system for the clients when needed. The relationships and bonds that have been built with the pets and clients over the years is what keeps Ashley doing what she loves. She currently has 1 dog and 2 cats. When not working, Ashley loves being outdoors kayaking, camping and just being around friends and family.

In his free time, Dr. Hamilton has even provided cancer care for local zoos!

We'll be with you every step of the way.