Doctors and Management

In the event of an emergency, you want experienced medical personnel working on your pet. One or more veterinarians are always staffing our clinic. Each is an experienced emergency clinician. Our veterinarians have a combined 80+ years of emergency experience.

At the North Peninsula Veterinary Emergency Clinic we have a team of highly skilled Registered Veterinary Technicians and Veterinary Assistants to care for you and your pet. We are very proud of our highly-qualified and deeply compassionate veterinary team.

​​​​​​​Medical Director

joel wolf

Tom Hansen, DVM DABVP

Dr. Thomas Hansen grew up in Northern California and earned both his Bachelor of Science (Animal Science) and Doctorate of Veterinary Medicine from the University of California, Davis. He is board-certified in canine and feline practice by the American Board of Veterinary Practitioners. His favorite areas of practice are emergency care, ultrasound, and internal medicine. In his spare time he enjoys travel, movies, aviation, and anything related to cats.

​​​​​​​Our Doctors

joel wolf

Dr. Joel Wolf, DVM

Dr Wolf received his B.A. in Integrative Biology from UC Berkeley and his Doctor of Veterinary Medicine from UC Davis in 2000. He completed a rotating internship in small animal surgery and internal medicine at the Animal Special Group in Los Angeles. After completing his internship, Dr. Wolf worked part time at multiple emergency and small animal general practices throughout the Bay Area. He became a full time staff veterinarian at NPVEC in 2004. When not at work, Dr. Wolf enjoys golfing, snowboarding, playing poker, and spending time with friends and family.

kelly hovde

Dr. Kelly Hovde, DVM

Dr. Hovde has been a staff veterinarian at North Pen since 1995. She is a graduate of the College of Veterinary Medicine at the University of Illinois. She completed a Small Animal Emergency Critical Care Internship from Veterinary Emergency Service in Fresno, Ca. She is a member of VECCS, PVMA, AVMA, and IAAHPC. Currently she works as a relief veterinarian at the San Jose City Shelter. She particularly enjoys geriatric medicine. Dr. Hovde lives with her cat Dino.

sara rose

Dr. Sara Rose, BVMS

Sara Rose holds a BS in Avian science from UC Davis and completed her veterinary degree in 2012 at the University of Glasgow, Scotland, graduating with distinction in pathology. Immediately following graduation, Dr. Rose finished a small animal rotating internship at a private referral center in Boston. She then went to work at an emergency and referral hospital for two years in Manchester, New Hampshire. After nearly a decade of adventures outside of her home state, Dr. Rose is finally back in the Bay Area. She became a full time veterinarian at North Pen in July 2016. In addition, she works with Well-Pet Vet Clinic in Pittsburg, CA, providing affordable preventative care and vaccines for the community; and volunteers with the spay/neuter program of BADRAP, a Bay Area-based pit-bull advocacy group. In her spare time, Sara loves to hike, camp, and kayak with her mini daschund mix Reggie. She also travels as much as possible, makes wine with her family, and gardens with her backyard chicken flock "The Golden Girls".

sara rose
Dr. Sue MacInnes, DVM
slyvia graham

Dr. Sylvia Graham, DVM

Dr. Graham has over 25 years of veterinary emergency experience and has been working at North Pen since 2003. In addition to practicing emergency medicine, she owned her own exclusively feline private practice. Dr. Graham graduated from UC Davis with a Bachelors degree in zoological science as well as a Doctor of Veterinary Medicine. She is a member of the AVMA, CVMA, the peninsula veterinary association and the Alameda County Veterinary Association. Dr. Graham is president and founder of the Association of Multicultural Veterinarians which raises funding for scholarships and mentors students from diverse backgrounds that have an interest in the field of veterinary medicine. She is a recipient of the distinguished Iverson Bell Award. Dr. Graham lives in Berkeley with her husband, two cats, three Yorkies, and one pit bull. All are rescues, including the husband.

Dr. Lilliam Alfarro, DVM

Dr. Lilliam Alfarro, DVM

Dr. Alfaro pivoted from a focus on going to law school in the span of one day due to an injured bird and has never looked back. She received her DVM from The Virginia-Maryland Regional College of Veterinary Medicine and has practiced veterinary medicine in many different contexts including shelter medicine, primary care, emergency medicine. She and her husband enjoy the company of two young sons and a daughter and a little squadron of furry companions.


Tricia Mallory
Tricia Mallory, CPM, CRVT
Practice Manager

Tricia has extensive experience in the Veterinary field. Earning her Certification as a Veterinary Technician in 1993, she continued to further her career by becoming a triple boarded Veterinary Technician in Critical Care, Dentistry, and Radiology. For the past 14 years she has worked in practice management, practice development, and marketing. In 2009 she became a Certified Practice Manager.
Mia Ollikainen

Shanna, RVT
Nursing Director

​​​​​​​Shanna ONeill has been working at North Pen for 2 ½ years and is a Registered Veterinary Technician with over 18 years of experience in the Veterinary field.

As an RVT, she has spent the majority of her career in emergency medicine and has a proven track record for working calmly and efficiently under chaotic demands.

In emergency clinics where the veterinary tech staff has also provided all reception duties, she has won customer loyalty by providing the caring support needed by emotional clients worried about their suffering furry friends. She had 5 furry friends of her own, 3 crazy terriers and 2 opinionated felines. Unfortunately, she lost her JRT at 18 years of age this last spring – and still misses her. She loves her field, believes in the value of continuing education for herself and her co-workers, and is passionate about ensuring quality patient care. When she’s not in the hospital, she’s enjoying the outdoors with her 2 terriers or snuggling with her 2 cats watching movies


Office Administrator

Tammy always knew she had a passion for helping people. She didn’t learn until later that much of her life’s work would involve improving the health and well-being of other people’s beloved pets, but it has become one of her passions. She has worked in general veterinary practice, emergency, and oncology, for a total of 18 years now, and continues her learning odyssey by joining North Peninsula Veterinary Emergency Clinic. She now has a dog named Apple. In her free time she loves dancing, cooking, board games and outdoor activities with her children.


Dr. Amy Allen, DVM, Diplomate, ACVIM
Dr. Amy Allen, DVM, Diplomate, ACVIM
​​​​​​​Internal Medicine & Endoscopy

Dr. Amy Allen received her B.S. in Biological Sciences from Stanford University and her Doctor of Veterinary medicine from UC Davis. She completed an internship and residency in Internal Medicine. Dr Allen performs in-house endoscopic procedures, which include foreign body retrieval and biopsies or sampling from upper and lower GI, rhinoscopy, nasopharyngoscopy, laryngoscopy, bronchoscopy, vaginoscopy and cystoscopy. As a board certified internist, she is also available to consult on a number of different types of cases. Dr. Allen can be found spending time with her family in the North Bay and loves to play soccer and travel.
Dr. Bill Rivers, DVM, PhD Radiology

Dr. Bill Rivers, DVM, DACVR, PhD Radiology

We are very pleased to have Dr. Bill Rivers as our consulting radiologist. Dr. Rivers graduated from the UC Davis School of Veterinary Medicine in 1984 and, after an internship with Dr. Steven Ettinger in Los Angeles the following year, he practiced general small animal medicine in the San Francisco Bay Area for several years. Dr. Rivers then completed specialty training and a PhD in Radiology from the University of Minnesota. He became board-certified as a specialist in Veterinary Radiology by the American College of Veterinary Medicine in 1995. After being on staff at two veterinary schools and a private specialty practice, he established his Bay Area Consulting practice in 1989. Dr. Rivers performs the more complicated ultrasound examinations on our patients. His extensive training and experience helps us to provide the highest level of care for our patients.

Carrie Jurney DVM, DACVIM

Dr. Carrie Jurney DVM, DACVIM

Dr. Jurney is originally from Atlanta, and graduated summa cum laude from the University of Georgia, College of Veterinary Medicine in 2005. After vet school she completed an internship at the VCA Specialty Center of Seattle and her neurology residency at the University of Pennsylvania. She was awarded her neurology diplomate in 2009 and her Advanced Neurosurgery Certificate in 2011. While at UPenn she found her love of teaching, and excelled making the often unloved doctrine of neurology both understandable and practical for her students. This skill has served her well across numerous speaking engagements, in teaching residents and while educating her clients about their pet's condition. Dr. Jurney is an enthusiastic clinician. While she enjoys all of neurology, neurosurgical procedures and neurocritical care have a special place in her heart. n 2015, she decided to combine her love of neurology, traveling and education and Jurney Veterinary Neurology was formed. She currently lives with her husband and their pets in beautiful San Francisco. In her spare time Dr. Jurney is a sculptor, stained glass artist and adventurous cook.

Dr. Bill Rivers, DVM, PhD Radiology
Dr. Dean Filipowicz, DVM, MS, DACVS

Dean is published in several veterinary journals, has co-authored book chapters, and has spoken at a number of conventions and symposiums. His masters research investigated an emerging type of orthopedic fixation which has since become the gold standard in human and veterinary orthopedics. Dean’s special interests include fracture management, sports medicine, oncologic and reconstructive surgery, minimally invasive surgery and advanced, multi-modal pain control.
When not at work, Dean can be found enjoying all outdoor physical activities that the area has to offer, especially if they involve water or mountains.