Our Staff


James Hammond, DVM, DACVIM (Neurology)

Dr. Hammond is a board-certified veterinary neurologist trained extensively in both medical and surgical neurology.  Dr. Hammond received his veterinary training at Cornell University and graduated in 2005.  He then completed a rotating internship in medicine and surgery at Red Bank Veterinary Hospital in New Jersey.  He stayed on at Red Bank to complete an internship in Neurology and Neurosurgery and then a 3-year residency.  He received his board-certification in 2010 from the ACVIM.  Dr. Hammond’s areas of interest include intracranial and spinal surgery as well as diagnosis and treatment of inflammatory disorders of the CNS.

Jennifer Perkins, VMD, DACVIM (Neurology)

Dr. Perkins received her veterinary training at the University of Pennsylvania and graduated in 2011. After completing a rotating internship in medicine and surgery at Red Bank Veterinary Hospital in New Jersey, she joined Pieper Memorial, where she completed a specialty internship in Neurology and Neurosurgery in 2013, followed by a 3-year residency. She then received her board-certification in Neurology from the ACVIM. Dr. Perkins has a special interest in intervertebral disc surgery, as well as seizure management.

Benjamin Olson, DVM, DACVIM (Neurology)

Dr. Benjamin Olson obtained his veterinary degree from Purdue University College of Veterinary Medicine.  He then completed a rotating internship followed by a 3-year residency program in neurology and neurosurgery at The Animal Medical Center in New York, NY. In 2017, he received his board-certification in Neurology by The American College of Veterinary Internal Medicine. Dr. Olson is trained extensively in both medical and surgical neurology.  His special interests include spinal surgery, traumatic brain injury, inflammatory brain disease, and caudal occipital malformation syndrome.


Jennifer Lansdowne, DVM, MSc, DACVS, DECVS

Dr. Jennifer Lansdowne is originally from Ontario, Canada where she received her DVM concurrent with a Master’s of Science in Minimally Invasive Surgery in 2003 from the University of Guelph. She then completed a Small Animal Rotating Internship at Colorado State University followed by an Orthopedic Fellowship and Surgical Residency at Michigan State University in 2008. Dr. Lansdowne spent two years in Davos, Switzerland working at the AO Foundation Research Institute as a pre-clinical surgeon and then returned to her true passion of small animal surgery joining a private practice in Pittsburgh PA until 2012. Dr. Lansdowne has written over 15 scientific publications and several orthopedic textbook chapters. She is a Diplomate of the American College of Veterinary Surgeons and the European College of Veterinary Surgeons, is an Associate member of the Veterinary Society of Surgical Oncology (VSSO), an AOVet Active member and a member of the AVMA.

Ariane Jay, DACVS, DVM

Dr. Jay received her veterinary degree from Cornell University in 2010. She then continued her training at Cornell, completing a 1 year rotating internship in medicine and surgery in 2011, followed by a 3 year surgical residency. Dr. Jay was thrilled to join the surgical team at Pieper Memorial in 2014. She has received surgery training in both soft tissue and orthopedic procedures. She is experienced in both the Tibial Plateau Leveling Osteotomy and Tibial Tuberosity Advancement to treat canine cruciate ligament disease, and enjoys minimally invasive surgery including arthroscopy and laparoscopy. Dr. Jay has been involved in many research studies, and her special interests include septic peritonitis and spontaneous non-traumatic hemoabdomen in dogs. Dr. Jay shares her home with her husband, their two dogs Dean and Poe, and their cat Louie. When not at the hospital she enjoys road trips and hiking with her family along the beautiful New England coast.

Heather Mossman, BVSc (dist.), DACVS-SA

Dr. Mossman graduated from Kalamazoo College before attending veterinary school at Massey University in New Zealand, where she graduated at the top of her class. She practiced as a primary care veterinarian in Michigan and in England before returning to the States to pursue further training. Dr. Mossman completed her internship at MSPCA-Angell Animal Medical Center in Boston. She then completed her surgical residency at Veterinary Surgical Centers in northern Virginia, where her research included evaluating techniques for tibial plateau leveling osteotomy (TPLO).

She brings a compassionate and high standard of care and enjoys the challenge of a diverse soft tissue and orthopedic caseload and keeping up with latest techniques and research. Her special interests include pain management, critical care, advanced soft tissue techniques including skin reconstruction and minimally invasive techniques such as laparoscopy and thoracoscopy.

Whitney Phipps, DVM, Practice Limited to Surgery

Dr. Whitney Phipps, DVM, is a veterinary surgeon who graduated cum laude from the University of Missouri College of Veterinary Medicine in 2013. She completed her residency at Tufts University Cummings School of Veterinary Medicine, and completed a small animal rotating internship at Angell Animal Center and a small animal surgery internship at Gulf Coast Veterinary Specialists. She lives with her pointer mix, Lucy, and enjoys yoga and jam making in her spare time. Dr. Phipps has special interests in surgical oncology, fracture repair, minimally invasive surgeries, and exotic and “pocket” pets. Her favorite part of being a veterinarian is being able to help families by maximizing their pet’s quality of life.


Carrie DeRegis, DVM, PhD, DACVIM

Dr. Carrie DeRegis first discovered the world of veterinary medicine during a summer job as a kennel assistant at Pieper-Olson Veterinary Hospital. Continuing her work at Pieper-Olson for almost 10 years, she advanced to the position of veterinary technician after earning her degree in Veterinary Science Technology After leaving Pieper-Olson to advance her education further, Carrie attended Tufts University earning her DVM and graduating as valedictorian of her class in 2002. Following an internship in Small Animal Medicine at Tufts completed in 2003, she went on to earn a PhD in Comparative Biomedical Sciences from Cornell University in 2008. She returned to clinical practice as a Medical Oncology resident at Tufts and completed her training in 2011. Dr. DeRegis has been involved in many research studies and the publication of several journal articles.  After becoming board certified in veterinary oncology, Dr. DeRegis joined the team of specialists here at Pieper Memorial Veterinary Center. When not at the office, Carrie enjoys being outdoors as much as possible and walked 2000 miles for a cancer charity fundraising organization in 2013. When she’s not outside enjoying nature, she spends her time with her two cats enjoying music and trying new recipes in many international styles.


Sean Freer, DVM, DACVR

Dr. Sean Freer earned his veterinary degree from the Cornell University College of Veterinary Medicine in Ithaca, New York, in 2005. He completed a rotating internship in small animal medicine, surgery and emergency care at Red Bank Veterinary Hospital in Tinton Falls, New Jersey. He then returned to Cornell for his residency in diagnostic imaging and received his board-certification in 2009. He joins Pieper Memorial after spending two years as the radiologist at the Oradell Animal Hospital in Paramus, New Jersey.

Dr. Freer offers traditional and advanced imaging services including radiography, ultrasonography and ultrasound-guided biopsy procedures, computed tomography (CT) and magnetic resonance imaging (MRI). His special interests include vascular ultrasonographic and CT imaging.

Pieper Memorial and Dr. Freer are excited to be able to provide area veterinarians with two convenient ultrasound choices to offer their clients.  We offer “while your client waits” ultrasounds which may be scheduled Monday through Friday. If they prefer, your clients may instead select our ultrasound “drop-off” service. Patients should be fasted the morning of the ultrasound unless it is deemed unsafe to do so (e.g. diabetic patients). On site CT and MRI allows for the scheduling of daily scans. Unsure of which imaging modality is the best fit for your patient? Dr. Freer encourages inquiries to help determine the best (and most cost effective) imaging solution for your patient. He may be reached at (860) 347-VETS (8387) or via email at sfreer@piepermemorial.com  Digital and traditional film reading services are also available.

Internal Medicine

Carolyn Gross, DVM, DACVIM

Dr. Carolyn Gross first discovered her passion for veterinary medicine during her undergraduate research on frog embryos at the University of Massachusetts Amherst.

From there, she attended Tufts University, earning her DVM and graduating as her class speaker in 2011. Following a rotating small animal emergency focused internship through VCA Norwalk and Shoreline practices, Dr. Gross went on to complete a residency in Internal Medicine at the University of Pennsylvania. She joined the team of specialists at Pieper Memorial in July 2015 and has a special interest in endocrine diseases (Diabetes Mellitus, Cushing’s Disease, Addison’s Disease, and Thyroid Disorders) as well as kidney and liver disease.

Throughout her career, Dr. Gross has also taken opportunities to study and work on elephants in the wild, completing an expedition to track migration patterns in Africa as well as research on behavior and vocalizations in Nepal. When not in the office at Pieper Memorial, Dr. Gross enjoys spending time with her furry family (three cats and two dogs) as well as outdoor activities (hiking and kayaking). She also writes in her spare time – you can check out her first novel, Preda’s Voice on Amazon.com.

Sarah Winzelberg, VMD, DACVIM

Sarah Winzelberg VMD is an Internal Medicine specialist who has worked at our Pieper Memorial location since 2017. Originally from Pittsburgh and Manhattan, Dr. Winzelberg received her VMD from the University of Pennsylvania and completed her internship and Internal Medicine residency at the Animal Medical Center in NY, NY, where she specialized in the study of infectious diseases. Her other medical interests include renal disease, hematology, and gastroenterology. When not working, she enjoys biking, yoga, gardening, cooking, and spending time with her family.


Carol Himsel, DVM

Dr. Carol Himsel has an educational background in biology and biochemistry and earned her DVM degree from Purdue University College of Veterinary Medicine in 1984, followed by a small animal medicine and surgery internship also at Purdue. Dr. Himsel practiced general medicine and surgery in California and in Connecticut for several years. Since 2003, she has trained and focused on emergency and critical care. Dr. Himsel very much enjoys working with people as much as with their pets.

Aside from clinical practice, Dr. Himsel has an interest in writing and has authored several books for Barron’s Educational Series, Inc. She is a member of the Veterinary Emergency and Critical Care Society and the American Veterinary Medical Association. Active in organized swimming, Dr. Himsel is a member of US Masters Swimming, and has been a certified stroke and turns official for Connecticut Swimming, Inc. She and her family live in Ivoryton with their golden retriever, Binney and cats Kramer and Blossom.

Resuscitation & Critical Care

Matthew Turner, DVM, MSc, DACVECC

Dr. Matthew Turner is a Diplomat of the American College of Veterinary Emergency and Critical Care. He holds degrees from Cornell University, the University of Edinburgh, SUNY Cobleskill, and North Carolina State University’s College of Veterinary Medicine. After completing a small animal rotating internship at the Veterinary Referral and Emergency Center in Norwalk & Shelton, CT he went on to practice emergency medicine in various specialty and emergency hospitals outside Philadelphia.

When he realized his calling, he went on to complete a residency in Emergency and Critical Care Medicine at Cape Cod Veterinary Specialists. There, he achieved the rank of chief resident and presented his research at national conferences. Dr. Turner’s special interests include shock, resuscitation, sepsis, cardiac emergencies, mechanical ventilation, and emerging technologies in Critical Care Medicine.


Amy Lawton, CVT, VTS

Amy Lawton, CVT, AVTAA (Anesthesia) graduated from Becker College in 1993 with an Associate’s Degree in Veterinary Technology. She worked at Tufts University School of Veterinary Medicine from 1994-2005 in the ER/ICU and Anesthesia departments. In 2003 she received her Veterinary Technician Specialty (VTS) in Anesthesia. In 2005 she moved north to work at Dover Veterinary Hospital in Dover, NH as the head technician. In 2008 Amy was transferred to Port City Veterinary Hospital in Portsmouth, NH as the head technician of the anesthesia/surgery department. In June 2010 Amy joined Pieper Memorial Veterinary Center as the Director of Technical Services.

Amy has a special interest in relieving anxiety and minimizing/treating the pain veterinary patients experience. She has given several lectures in local and national veterinary conferences. She has published articles in Veterinary Technician and a book chapter on anesthesia monitoring. In her spare time Amy, can be found hiking with her dogs, gardening, and participating in canine agility trials.