Our Doctors And Staff


John J. Haburjak, DVM, DACVS

Dr. John Haburjak graduated from UC Davis Veterinary School in 1993 with his Doctor of Veterinary Medicine Degree. He practiced for 5 years before returning to academics to complete a combined surgical residency program in San Diego and the University of Illinois.

Dr. Haburjak is a Diplomate of the American College of Veterinary Surgeons; and his research interests include orthopedic trauma and disorders of the carpus. He has several publications in the Veterinary Orthopedic and Traumatology Journal, Journal of Small Animal Practice and the Journal of the American Animal Hospital Association. His clinical surgical interests include surgical oncologic procedures of the face, head and neck, corrective orthopedic procedures and neurosurgery (spinal). Finally, he has dedicated most of his post-graduate emphasis on minimally invasive procedures including: laproscopy, thorascopy and intervential radiology (urethral and tracheal stenting).

Dr. Haburjak’s hobbies include SCUBA diving, Oakland A’s baseball, road cycling and cooking (not to mention eating, too!). He shares his life with his wife, Aimee (also a veterinarian), daughters Eva & Emery and a son Ian, Addison (bubble-headed Japanese spaniel), Poppy (a Cavalier King Charles Spaniel with a freckled nose!) and S'mores the mini-Lop.

Andrew M. Grange, BSc (Hons), BVetMed, DACVS

Dr. Andrew Grange is a Diplomate of the American College of Veterinary Surgeons. He attended University College London where he received his bachelor's degree in orthopedic science in 2005. He then graduated in 2008 from the Royal Veterinary College in London with a degree in veterinary medicine. Following graduation he completed a rotating internship at VCA Emergency Animal Hospital and Referral Center in San Diego, and a residency in small animal surgery at Angell Animal Medical Center in Boston, MA.

His professional interests include the application of minimally invasive surgical techniques (laparoscopy, thoracoscopy and arthroscopy) in the management of soft tissue and orthopedic disease, and the surgical treatment of cruciate disease, fractures and angular limb deformity.

Dr. Grange's personal interests include skiing, cycling, ice hockey, rowing, and spending time with his wife, Allison (also a veterinarian), dog, Abby, and 3 cats, Twiglet, Piglet, and Blackjack.

Tracy Nicole Frey, DVM, DACVS

Dr. Tracy Nicole Frey was born and raised in the Chicago suburbs and received her Bachelor of Science degree from the University of Illinois at Urbana-Champaign with a major in Biology in 1998. She is a 2002 graduate of the University of Illinois College of Veterinary Medicine. Dr. Frey completed a small animal rotating internship at Long Island Veterinary Specialists in Plainview, New York in 2003, and was in general practice in Deer Park, New York until 2004. She then began a 2 year surgical internship followed by a 3 year surgical residency at Garden State Veterinary Specialists in Tinton Falls, New Jersey. Dr. Frey is a Diplomate of the American College of Veterinary Surgeons.

Dr. Frey enjoys all aspects of soft tissue surgery, particularly gastrointestinal and oncologic procedures. She has a special interest in pain management and critical care and will work closely with owners and referring veterinarians to provide the utmost compassionate care for her patients.

Dr. Frey's little princess is a Pomeranian named "Pouf!" whose favorite hobbies are spinning in circles, playing fetch and attacking socks!


Amanda (Surgery Technician)

Amanda is a Bay Area native, and grew up in Hayward. She has been working in the veterinary field for 16 years in multiple departments including client service, general practice, exotic animals, emergency medicine, internal medicine and surgery.

She also took a brief break from veterinary medicine to pursue a degree in the culinary arts and in her spare time is starting her own food truck business but absolutely loves working with animals and people, and believes working at Veterinary Surgical Centers couldn't be a more perfect fit.

Amanda has one 4year old son named Noah, who is very energetic and a toy poodle who she rescued about a years ago. In her spare time, Amanda really enjoys camping, fishing, attending football and basketball games, cooking, eating, and going to see movies with her son.

Marcela (Surgery Technician)

Marcela grew up in Fremont. She has always loved interacting with animals and decided at an early age that she wanted to be in the veterinary field. Marcela graduated from U.C. Riverside with a bachelors of science in biology in 2008. She got her first position as a veterinary assistant in July of 2009 in a general practice clinic, and has been loving working in the veterinary field ever since.

Marcela currently lives with her twin sister, her Yorkie Marley, and her Chihuahua mix Pepe. She hopes to get her license to become an R.V.T. in the near future. Some activities she enjoys when not helping animals are playing soccer, going to Golden State Warriors games, hiking, and spending time with family & friends.

Hannah (Surgery Technician)

Hannah was born and raised Alameda. She has always had animals in her household and began working at a veterinary clinic in 2008. In 2011 she received her AS in Veterinary Technology from Carrington College. She lives with her older brother and her dog Tyson. She enjoys spending time with her family and friends outdoors.

Aimee (Surgery Technician)

Aimee was born and raised in the East Bay and has lived all over the 510, but Oakland is dearest to her heart. Caring for animals has always been an intrinsic part of her nature; growing up she loved to nurture the street cats that roamed her neighborhood.

After experiencing what to her were joyless day to day machinations of working at an office job she applied to an entry level technician position at an emergency clinic in Antioch. She was definitely hooked and wanted to pursue a career in the profession!

Aimee's technician skills have grown since being exposed to Emergency Critical Care, General Practice, Spay/Neuter Shelter Care with a focus on community outreach to where she is currently settled as a surgical nurse at VSCB.

Aimee shares her home with her one-eyed bat-huahua Rocko, chunky monkey yorkie Julian, a gorgeous were-cat named SmokeStack, and two betta fish, Dracul and Odysseus.

Aimee loves to explore the Bay Area by hiking around with her dogs, eating diverse types of food and curling up on the couch watching movies with her dogs.

Ana, RVT (Surgery Technician)

Ana is a San Francisco native who’s been living in Oakland for 8 years. She lives with her super bright & silly 5-year-old daughter, Naomi. They have two pets; a 10-year-old Border Collie mix named Anola, and a 9-year old Burmese mix cat named Nike. She is very family oriented and values creating memories with her loved ones.

Ana has been in the veterinary field for 10 years. She earned her Associate of Science in Veterinary Technology from Western Career College in 2007 and became a Registered Veterinary Technician in 2009. She has experience working in multiple veterinary fields; shelter medicine, high volume spay/neuter clinic, exotics (pocket pets), veterinary dentistry (her favorite) and general practice. She is thrilled to continue her career with VSC as a surgical nurse. She joined the team in August.

In her spare time, she loves biking, attending San Francisco Giants baseball games, going to festivals & farmers markets, hiking, listening to pop & alternative music, and being close to the ocean. She also loves playing catcher for her softball team (SF SPCA Kittens) in the spring & summer.

Donnetta (Surgery Technician)

Donnetta attended Western Career College (Carrington College) and received her Associate of Science in Veterinary Technology in 2007. She worked in General Practice for 11yrs prior to joining the VSCB team in March of this year, and is enjoying the opportunity to expand her horizons by branching off into specialty surgery.

Donnetta has always had a strong affinity for animals. Some of her most cherished memories growing up are with her German Shepherd "Daisy" and Orange Tabby "Kizzy," as well as the many small and large pets that have been part of the family throughout the years. She doesn't currently have any pets, so she sees every pet she cares for as a chance to treat them like her own for the time they are in her presence.

Donnetta was born and raised in San Francisco and now resides in San Leandro with her three fun loving kids. In her spare time, she loves outdoor activities, music, and being around her family.

Trish (Surgery Technician)

Trish became interested in veterinary medicine very early in her professional career. She had been running her own smoothie shop, but made the decision to pursue a career that she truly loved. Veterinary medicine was a perfect fit, as she grew up riding horses in the North Bay, and has a 35 year old mare name Cricket, who Trish has had since she was ten years old. Of course Trish initially thought she would end up in large animal medicine, but small animal medicine stole her heart while she was in tech school. She graduated from Western Career College, Pleasant Hill, CA in 2009, feeling truly inspired by the science, sense of compassion, and critical thinking.

Trish has also volunteered time at a local shelter, becoming a strong advocate for rescuing and adopting animals. She also volunteered at a local wildlife hospital, where she experienced releasing red tailed hawks and cedar waxwings, as well as participating in nursing humming birds, raccoons, squirrels, opossums, etc., back to health.

Trish and her husband share their home with their two canine "fur children." Charlotte, is a seven year old rescue from San Francisco Animal Care & Control, and has been in the family since three months old. Trish describes Charlotte as "her husband's shadow." Lilikoi or "Lee Lee" for short is the couples "honeymoon pup," as they adopted her after taking a field trip to the humane society in Kauai during their honeymoon.

During their free time, the couple enjoys hiking, taking the dogs to the beach, going to music festivals/concerts, crafting, and camping.

Halle (Client Services Representative)

Halle grew up loving animals, so much so she vividly remembers having to be removed from a bull fight in Spain when she was five years old because she got physically sick about it.

Halle graduated from The American Institute of Foreign Study, London, with honors, and then earned her Bachelor degree from UC Santa Cruz. She joined the VSC Customer Service Representative team in April of last year, and brings over a decade of experience in the veterinary field.

Halle and her husband share their Berkeley home with their four furry canine kids and their daughter, who Halle affectionately refers to as her “small, not so furry, feral critter.” This exemplifies the great sense of humor that anyone who knows Halle has come to cherish. Halle’s passions include photography, art appreciation, and gardening.


Erin Wettstein, RVT (Technician Manager)

Erin lives in San Francisco with her husband Tobias and their two dogs Thor and Noodle. She has been working in the vet field since 2007, and is an RVT. In her free time she loves to roller skate, bike ride, hike with her dogs and cruise around town on her scooter.

Zoen Heimbach (Chief Operating Officer)

Zoen was born in Clearwater, Florida, but moved to Californial as a young child, and grew up in the Bay Area.

Zoen joined the VSC team in December of 2010, and although he didn't come from the veterinary field, he has always believed he has had a greater affinity towards animals than the average person, and even his childhood home was an "unofficial" refuge for neighborhood cats that sometimes found themeselves needing a home. The melding of his love for animals and business management makes joining the VSC team a fitting direction for his career path.

Prior to joining the VSC team, Zoen has spent a lot of his time in positions of coaching and leadership for youth groups, summer camps, and after school programs, and also has an extensive background selling business to business services.

Zoen has a Bachelors degree in Business Administration with a focus on corporate management from CSU East Bay (formerly CSU Hayward).

Zoen and his wife Jenna have been together for 12 years, and married for just over 5. In their free time Zoen and Jenna enjoy A's games, practicing with and playing on their co-ed softball team, hiking, and camping together. They share their home with their two cats, Mac and Maisey.