Meet Our Specialists


Roger K. Johnson, DVM
Diplomate, ACVIM

Education: Oregon State University undergraduate. Pre-Vet from 1962 to 1965. Graduated from Veterinary School in 1969 from Washington State University. Internship at The Animal Medical Center in New York from 1969 to 1970. Completed Internal Medicine Residency in 1971 from The Animal Medical Center. Practicing Internal Medicine since 1977.

Professional Interests: Cardiology, echocardiography, abdominal ultrasonography and endoscopy.

Personal Interests: Skiing and bicycling.

Professional Organizations: AVIM, AAHA, CVMA, CCVMA


“My interest in veterinary medicine grew out of growing up in rural southern Oregon. My first exposure to veterinary medicine was with a farm animal veterinarian. While in veterinary school, however, it became clear that my calling was with dogs and cats, where more in-depth medicine could be practiced. I was initially driven by the science; however, over the years the patient’s well being has prevailed as my driving force.”



Peter Nurre, DVM
Diplomate, ACVIM

Education: San Francisco State University, majored in Biology and Nutrition, graduated in 1993. University of California Davis Veterinary School graduate of 2001. Completed rotating internship and internal medicine residency at Encina Veterinary Hospital.

Professional Interests: Internal medicine and cardiology.

Personal Interests: Outdoor and sporting activities.

Professional Organizations: ACVIM, AVMA, AAHA, CVMA, CCVMA


“I chose veterinary medicine because I love working with pets and their families. Internal medicine is like a puzzle, many pieces fit together to reveal what we can do to best help the pet.”



Stephen Atwater, DVM, MS
Diplomate, ACVIM (Oncology)

Education: Lafayette College, graduated with a BS in 1981. Colorado State University College of Veterinary Medicine and Biomedical Sciences, graduated in1989. Completed Residency in Oncology and received Masters of Science degree in Clinical Sciences in 1993. Practicing Contra Costa County since 1996.

Professional Interests: Internal medicine, oncology.

Personal Interests: Family, gardening, cycling and cooking.

Professional Organizations: ACVIM, AVMA, AAHA, VCS, CCVMA


“I chose the field of oncology because I get to work with some of the most devoted and compassionate pet owners, helping them make the best decision for their animal’s cancer. This is an often satisfying aspect of a sometimes frustrating specialty. Often times, I can provide some hope, when none is expected. Although most of my patients are never cured of their cancer, they typically obtain good quality of life for the remainder of their time.”



Gerardo Martin Del Campo, DVM
Emergency Clinician

Education: BS from University of California, Davis, graduated in 1996. University of California, Davis, School of Veterinary medicine, graduated 2000. Completed rotating internship from Veterinary Specialty Hospital of Rancho Sante Fe in 2001. Practicing emergency medicine in contra Costa County since 2001.

Professional Interests: Emergency medicine, managing cases with underlying cardiac disease.

Personal Interests: Fishing, basketball and golf.

Professional Organizations: CVMA, AVMA


“I enjoy being able to help my clients with their pets during a critical time when their family veterinarian is not available.”



Carl Koehler, DVM
Diplomate, ACVS

Education: Graduated from University of California, Davis School of Veterinary Medicine in 1998. completed rotating internship in 1999 at the California Animal Hospital in West Los Angeles. Completed a surgical internship in 2001 from Gulf Coast Veterinary Specialists in Houston, Texas. Completed a small animal surgical

Personal Interests: Biking, hiking and most outdoor activities.

Professional Organizations: AVMA, VOS, ACVS


“I have always liked the challenge of medicine and surgery, and working with animals has always been my passion.”



Jenifer Wang, DVM
Internal Medicine Resident

Education: Graduated form UC Berkeley with a BA in Anthropology and Integrative Biology. Graduated from Ross University, School of Veterinary Medicine in 2007, clinical year at University of Wisconsin, Madison. Internship and Residency at Encina Veterinary Hospital.

Professional Interests: Gastrointestinal disease, renal and liver disease.

Personal Interests: Hiking, mountain biking, cooking and exploring the world.

Professional Organizations: AVMA, CCVMA


“veterinary medicine is a field that has always interested me. Even though it can be very challenging and complex, the ultimate reward is the satisfaction of helping the animals as well as their people.”



Katrina Hall-Essoe, DVM
Diplomate, American Veterinary Dental College

Education: Tuskegee University School of Veterinary Medicine, graduated in 1995. Completed internship in small animal medicine and surgery at Angell Memorial Animal Hospital in Boston, MA. Dental Residency at Main Street Small Animal Hospital in San Diego, CA. Practicing at Encina Veterinary Hospital since 2002.

Professional Interests: Small animal dentistry, oral surgery and speaking locally and nationally about veterinary dentistry and oral surgery.

Personal Interests: Traveling, outdoor activities and spending time with her husband, 5 cats and 1 dog.

Professional Organizations: AVMA, AAHA, CCVMA, AVDS, IVAPM, National Society Phi Zeta.


“Becoming a veterinarian was a childhood dream for me. Animals have always played an important role in my life and I feel fortunate to be in a position where I can help them and their families.”



Sarah Bonner, DVM
Diplomate, American Veterinary Dental College

Education: Graduated from University of California Santa Cruz with a B.A. in Psychobiology in 2001. Veterinary graduate of University of California Davis in 2007. One year rotating internship at University of Minnisota and a three year residency in Dentistry and Oral Surgery at the University of Pennsylvania.

Professional Interests: Surgical management of oral tumors and palatal defects.

Personal Interests: Hiking, reading and wine sampling.

Professional Organizations: AVMA, AVDS, National Society Phi Zeta.






Pietro Filippo Adamo, DVM
Diplomate, ECVN

Education: Graduated from University of Pisa, School of Veterinary Medicine in 1986. Completed an internship in Small Animal Medicine and Surgery at the Tuskegee University Small Animal Clinic in Alabama in 1991. Passed the European College of Veterinary Neurology board to become a diplomate in 1997. Passed the ECFVG certification exam in 2006. Became licensed to practice in California in 1997.

Personal Interests: Classical music, playing Brazilian rhythm, soccer and Capoeria dance.

Professional Organizations: CVMA, ACVMA, AVMA, AAVC, SFVMA, European Society of Veterinary Neurology, Societa Italiana di Neurologia Veterinaria and is a founding partner of Academy Italian Dipl. Europei College Vet.


“I graduated veterinary school with the intent of making changes in the lives of ourlittle furry friends: by treating them with the respect that all patients deserve, by applying state of the art medicine and by developing and implementing the latest technology for the treatment of my patients; diseases.”



Meredith Stepita, DVM
Diplomate, ACVB

Education: Veterinary graduate of the University of Tennessee 2006, small animal medicine and surgery internship at Southern Arizona Veterinary Specialty and Emergency Center 2006-2007. Completed residency in clinical behavior at UC Davis in 2011.

Professional Interests: Puppy socialization, canine aggression, canine aniety and the human to animal bond.

Personal Interests: Cooking, traveling and canine training.

Professional Organizations: ACVB, AVMA, AVSAB, CCVMA, CVMA


“I decided to pursue veterinary medicine so that I could best help animals, and in veterinary school I discovered my passion for behavior. I am fortunate to have a very rewarding career, helping dedicated owners work through behavior problems with their pets and potentially save pets from relinguishment to shelters.”



Molly Priest, DVM
Emergency Clinician

Education: UC Davis School of Veterinary Medicine graduate of 2009. California State University Chico, sigma cumme laude BS in Biology 2005.

Professional Interests: Emergency and critical care medicine, management of head trauma and toxicological emergencies.

Personal Interests: Cooking, wine tasting, being outdoors with family and reading.

Professional Organizations: CCVMA, CVMA



“Becoming a veterinarian was a childhood dream following a profound passion for animals. Emergency medicine quickly became my calling in part for the challenge but also the chance to help and console in an otherwise scary and critical situation for animals and their family.”