Thirteen veterinarians, four board certifications, one phone number.

Dr. Marcus Whitaker

DVM · DACVS · Soft-Tissue Surgeon · Co-Founder & Director of Medicine

Marcus graduated from UC Davis School of Veterinary Medicine in 1995 and completed his soft-tissue surgical residency at Colorado State in 1999. He sat for ACVS boards in 2001 and has been a Diplomate of the American College of Veterinary Surgeons ever since. Before opening Field & Stone in 2009 he spent eight years on staff at a corporate specialty hospital in West Los Angeles, where he performed an estimated 4,500 surgical procedures.

His clinical interests are abdominal soft-tissue surgery (splenectomy, hepatic resection, complex GI work), otologic surgery (TECA — he has personally performed several hundred), and brachycephalic airway syndrome correction. He still does the surgery himself; there is no surgical resident performing his procedures. He reviews every imaging study personally before surgery and writes the operative note the same day.

Marcus published on TECA outcomes in JAVMA in 2011 and on perineal hernia repair technique in Veterinary Surgery in 2015. He has lectured on brachycephalic airway syndrome at WVC and AAHA continuing-education conferences for the last decade.

Their pet: Calvin, a 6-year-old chocolate Labrador retriever, lives at the hospital during the day and sleeps under Marcus's desk during surgical rounds.

Dr. Reema Sandhu

DVM · DACVS · Orthopedic Surgeon

Reema graduated from Tufts Cummings School of Veterinary Medicine in 2006 and completed her orthopedic surgical residency at Ohio State College of Veterinary Medicine in 2013. She became an ACVS Diplomate the following year and joined Field & Stone in 2014. The orthopedic OR was built around her arrival.

Her caseload is roughly 240 TPLOs per calendar year, plus fracture repair, patellar luxation correction, and arthroscopic work. She is one of approximately 280 board-certified veterinary orthopedic surgeons in private practice in the United States. She does not perform cervical spine work or intracranial neurosurgery — those go to a board-certified neurosurgeon at VCA Animal Specialty Group.

Reema has authored two textbook chapters on orthopedic decision-making and teaches the TPLO continuing-education course at the Western Veterinary Conference every spring.

Her pet: Pepper, a 4-year-old fawn boxer who acts as the unofficial office greeter and is known to nudge clients toward the treat jar.

Dr. Eleanor Vance

DVM · DACVIM · Internal Medicine Specialist · Co-Founder

Eleanor graduated from Cornell University College of Veterinary Medicine in 1988 and completed her internal medicine residency at UC Davis Veterinary Medical Teaching Hospital in 1993. She practiced internal medicine at UC Davis for eight years before joining Marcus in opening Field & Stone in 2009. She is one of the most senior practicing veterinary internists in the LA basin.

Her caseload covers the full ACVIM internal medicine remit — endocrine disease, GI disease, hepatic disease, renal medicine, infectious disease, and immune-mediated disease. She reads every abdominal ultrasound in the hospital personally; her audited error rate on missed pathology is below 1.5%. Complex imaging cases get sent for second-read confirmation to a board-certified veterinary radiologist.

Eleanor has published twenty-three peer-reviewed papers, primarily on chronic enteropathy management and on long-term Cushing's protocols. She lectures at ACVIM Forum annually.

Her pet: Ash, a 10-year-old gray Maine Coon, lies across her notebook during chart review and has destroyed three pens.

Dr. Ji-won Park

DVM · DACVIM (Oncology) · Veterinary Oncologist

Ji-won graduated from the University of Pennsylvania School of Veterinary Medicine in 2011 and completed his medical oncology residency at the Animal Medical Center in Manhattan in 2017. He sat for the ACVIM Oncology boards that year. Before joining Field & Stone in 2023 he practiced at a corporate referral hospital in Orange County, where he ran the oncology service for five years.

His practice is a consultation-first practice: a 60-minute first appointment, honest framing of cure-vs-quality-of-life expectations, and chemotherapy protocol design built around the family's goals. He has personally administered approximately 4,000 chemotherapy doses since residency. He does not perform radiation oncology — those cases go to UC Davis or California Veterinary Specialists Murrieta.

Ji-won has lectured on canine lymphoma protocol selection at VCS (Veterinary Cancer Society) annual meetings since 2020.

His pets: Atlas (a 7-year-old tan whippet) and Juno (a 5-year-old black whippet) ride to work with him every day and split a single dog bed in his office.

Dr. James Wallace

DVM · General Practitioner · Senior GP

James was the first general practitioner hired in 2011 after graduating from Western University. Twelve years on staff. His special interests are senior wellness medicine, feline practice, and cardiology workup. He sees 30-minute wellness appointments most days, and is the GP DVM who most frequently triages urgent intake.

His pet: Margaret, a 14-year-old tabby cat with a thyroid condition that he manages personally.

Dr. Sarah Cho

DVM · General Practitioner · Dentistry Lead

Sarah graduated from UC Davis in 2015 and joined Field & Stone in 2017. She completed the Academy of Veterinary Dentistry's advanced dentistry continuing-education program in 2021 and now runs the routine dentistry service in collaboration with Dr. Sandhu on complex cases.

Her pet: Otis, an 8-year-old French Bulldog who has had every brachycephalic airway syndrome correction Marcus offers.

Dr. Priya Iyer

DVM · General Practitioner

Priya graduated from Western University in 2018. Joined Field & Stone in 2020 after two years at a high-volume Pasadena GP practice. Special interests in feline medicine, behavior medicine, and nutrition consults.

Her pet: Daisy, a 6-year-old Bengal who has trained Priya to feed her at 4:47 AM exactly.

Dr. Daniel Torres

DVM · General Practitioner · Surgical Generalist

Daniel graduated from Texas A&M in 2014 and joined Field & Stone in 2019. He performs routine surgery in the soft-tissue OR — spays, neuters, mass removals — and assists Dr. Whitaker on complex cases. Special interest in canine sports medicine.

His pet: Ramona, a 4-year-old border collie who runs agility on weekends.

Dr. Hannah Levy

DVM · General Practitioner

Hannah graduated from Ohio State in 2019 and joined Field & Stone in 2022. She has a particular interest in end-of-life care and hospice management and works closely with Dr. Park's oncology service on palliative-only cases.

Her pet: Bartholomew, a 12-year-old beagle adopted as a senior.

Dr. Marcus Adebayo

DVM · General Practitioner

Marcus A. (not to be confused with Dr. Whitaker — the team distinguishes them as "Big Marcus" and "Surgeon Marcus") graduated from Tuskegee in 2017 and joined Field & Stone in 2023. Special interests in feline practice and exotic small mammals (rabbits, guinea pigs).

His pet: Joaquín, a 5-year-old Holland Lop rabbit.

Dr. Eleanor Khoury

DVM · General Practitioner · Newest Hire (2025)

Eleanor K. graduated from UC Davis in 2025 and joined Field & Stone immediately afterwards. She is the most recent hire on the GP team and is being mentored by Dr. Wallace through her first year. Special interests still developing — currently leaning toward soft-tissue surgery and feline practice.

Her pet: a foster rotation of senior cats from Pasadena Humane.

Dr. Anand Krishnan

DVM · Emergency-Capable Urgent Care

Anand graduated from Cornell in 2012 and spent six years in an emergency hospital in Long Beach before joining Field & Stone in 2020. He covers same-day urgent care most weekdays — GDV intake, splenic mass triage, foreign-body workup, acute respiratory cases. He triages the cases that arrive without an appointment.

His pet: Lola, a 9-year-old Australian Shepherd who has come to the hospital with him every working day for the last five years.

Dr. Margaret O'Sullivan

DVM · Emergency-Capable Urgent Care

Margaret graduated from Iowa State in 2010 and spent eight years in an emergency hospital in Seattle before moving to Pasadena. Joined Field & Stone in 2021. She and Dr. Krishnan cover urgent care between them so that one of them is on-site for triage every weekday.

Her pet: Theo, a 7-year-old Newfoundland whom she describes as "professionally unhurried."