Meet Our Team

Dr. Santos

Dr. Robert Santos, DVM


Dr. Robert Santos was born in Turlock and raised on a dairy farm. His deep love of animals led him to Wheaton College for his undergraduate work and then on to Purdue’s School of Veterinary Medicine (1991). His wife Kristen received her doctorate in education. They have two sons, Nickolaus and Teddy and a daughter Phoebe. They all live on their thirty acre ranch called, Einstein Acres that is completely run on solar power.

Since 1991, Dr. Santos has been a part-time instructor as MJC, teaching Animal Health and Animal Behavior. His community activities include serving on the Turlock Historical Society (1993) and the Chatom School Board (1995). He is the Past President of Turlock Downtown Association and was President for NSJVMA (Norther San Joaquin Veterinary Medical Association). He is now the Co-Chair for the Turlock Centennial Committee, and elected to the Turlock Irrigation District (TID) Board. He also is involved in Carnegie Arts Foundation, Turlock Rotary Noon Club, Turlock Masonic Lodge III 395, and Turlock Exchange Club. He created Vet Club for the local children with interests in animals and also does numerous speaking engagements throughout the year for clubs, 4-H groups, schools and various educational groups.

Dr. Doug Marks, DVM


Dr. Marks was born in Nebraska and grew up in North Dakota, Illinois, New York, and Alabama. After graduating high school, he attended Auburn University where he completed his undergraduate studies and earned his Doctorate in Veterinary Medicine. Immediately after completing school, Dr. Marks moved to Turlock and worked at Olive Animal Clinic in 1977 before opening a clinic in Patterson. Dr. Marks became partners with Dr. Santos in 2003. He is now “Mostly Retired,” but helps Monte Vista primarily with rescue surgeries in his free time.

Dr. Marks married his wife in 1971 and raised three sons in Turlock. They are now privileged with two grandsons. They have had many pets over the years including dogs, cats, horses, goats, and hamsters. He has been a member of Monte Vista Chapel for over 35 years, participates in the Turlock Rotary, and has been a Scoutmaster for over 20 years. He teaches pharmacology for veterinary technicians at MJC and enjoys all outdoor activities.
Dr. Marks

Dr. Brandon Barrett, DVM


Dr. Barrett received his bachelors in Biology from Cal Poly, San Luis Obispo in 1997. He then received his doctorate of Veterinary Medicine from UC Davis in 2001 and has been working at Community Veterinary Clinic ever since.

He treats both small animals (dogs and cats) and exotic species (birds, reptiles, amphibians, rodents, rabbits, etc.) Dr. Barrett and his wife Tonia, a local photographer, are both from Turlock. They share their house with their son Grayson, their dog, two cats, two chinchillas, two birds, a bearded dragon, and several fish.

Dr. Barrett is involved with teaching Vet Club for local children along with Dr. Santos and is an instructor at MJC teaching, Surgical and Dental Procedures.

You can also visit Dr. Barrett at:

Dr. Lee

Dr. Lee, DVM


Dr. Lee is a Central Valley native, born and raised in Stockton. She earned her Bachelor’s degree in Biology from UCLA and then graduated from UC Davis School of Veterinary Medicine. She has been working at Monte Vista Small Animal Hospital with our dedicated and talented team ever since graduation. 

From a young age, Dr. Lee has always had a passion for science and animals. She loves her calling and strives to improve her skills to help her patients live longer, happier lives. During vet school, she spent time doing cancer research, volunteering at low-income spay and neuter clinics, and had the opportunity to travel to Honduras to provide veterinary care to under-served areas. Dr. Lee has an interest in soft tissue surgery and also minimally invasive diagnostic tools, undergoing additional hands-on training in the use of the endoscope.

In her free time, she enjoys running, yoga, and gardening. One of her favorite past times is walking with her Jack Russell Terrier, Wally, and his Chihuahua sidekick, Cookie.

Dr. Renae Estrada, DVM


Dr. Estrada grew up in the Central Valley city of Denair. She earned her undergraduate degree at UC Davis and proceeded to attend the UC Davis School of Veterinary Medicine. She has been practicing at MVSAH since 2008 and has a special interest in surgery and ultrasound. Renae had the unique experience of working with Dr. Santos at our sister hospital, CVC, when she was in junior college. 

Outside of her professional life, she has two daughters, Avery and Cora. She also has three dogs, Ralph, Spencer, and Jasmine, and four cats, Murphy, Jack, Darcy, and Lily. Dr. Estrada enjoys camping, kayaking, and hiking in her spare time.
Dr. Estrada
Dr. Davis

Dr. Chelsea Davis, DVM


Dr. Chelsea Davis was born and raised locally in Turlock. She attended Fresno State University where she earned her BS in Animal Science. Following her time at Fresno, she graduated from Ross University as a Doctor of Veterinary Medicine. She completed her clinical year at Purdue University and has been practicing at MVSAH since 2017.

Chelsea currently lives in Turlock, and together, her and her boyfriend have three cats, Monroe (3 legged), Lena and Nala, and a Corgi named Kiwi. In her spare time, she trains and competes in dog agility with Kiwi and her parents’ Corgi, Kate. She enjoys golfing, camping, and beach trips. While attending vet school, she was scuba certified and was able to dive with sharks.

Dr. Villegas, DVM


Dr. Villegas was born and raised in a small farm town of Tanhuato, Michoacán, Mexico. His passion for animals began from his exposure helping his father care for the family farm.

Dr. Villegas left Tanhuato at a young age to pursue higher education, which led him to Mexico City. While there he attended College of Science and Humanities to obtain his bachelor’s degree in biology. He then went to the National Autonomous University of Mexico (U.N.A.M.) and completed his Doctorate of Veterinary Medicine.

Upon completion of his doctorate degree, Dr. Villegas moved to the state of Oaxaca to practice veterinary medicine and work for the federal government coordinating preventative care. Pursuing new opportunities lead him to the state of Chiapas where he worked in an animal diagnostics laboratory and taught microbiology, hygiene, and zootechnics at Autonomous University of Chiapas (U.N.A.C.H.). He obtained his license to practice in the United States through the Educational Commission for Foreign Veterinary Graduates at Oklahoma State University.

Outside of work, Dr. Villegas enjoys spending time with family, running, gardening, and traveling.

Dr. Villegas
Dr. Snable

Dr. Snable, DVM


Dr. Zack Snable was born and raised in Modesto, and his interest in veterinary medicine started when bringing family pets to Dr. Santos in the 1990’s. He left the Central Valley to attend college at Yale University, then Ross University for veterinary school and the University of Florida for clinical training. 

After practicing in Ventura for the last 11 years, he returned to the Central Valley to work with Dr. Santos at MVSAH and raise his young family. His wife Andrea, daughter Emma, son Evan, and their 3 deaf Cavalier King Charles spaniels are happy to now call Turlock home. 

When not working, his main passion is saltwater fishing- after living at the coast he is now excited to learn what the Central Valley has to offer for freshwater angling. He also enjoys gardening, fossil hunting and woodworking.


Nancy Santos

Finance Manager

As Finance Manager, Nancy oversees all financial, bookkeeping, and payroll duties at MVSAH. She is also an assistant to the Hospital Director.

Nancy has 35 years of experience in bookkeeping and business managing. She worked for the family dairy for 16 years and has been working for Dr. Santos for the last 19 years. Her love for animals is a job bonus.

Nancy lives on her 22-acre farm with her 3 dogs – Fred (only 3 legs), Hot Wheels, and Little Guy – and her 3 cats – Six Toes, Lilly, and Poppy.

P.S. She was also the one who caused Dr. Santos to run away at the age of 6. His venture was short-lived; he had forgotten to say good-bye to his pet parakeet.

To contact Nancy, email or call 209-634-0023. 

Sara Leimgruber

Hospital Director

Sara grew up as an East Bay local and earned her BS in Animal Science at Cal Poly, San Luis Obispo. She has worked in the veterinary industry since 2004, starting as a technician, working her way through many management roles, and currently serves as COO.

Sara married her college sweetheart, Andrew, and together they have two children, Claire and Jacob. They have a Border Collie named Remington, a Boston Terrier named Riley, and a Quarter Horse named Rio. Sara is in the Swiss Club and is a member of Cornerstone Community Church. The Leimgrubers love to travel and ride horses.

Chasity Mendes

Hospital Operations Manager

Chasity spent most of her life living in Hilmar before moving to Turlock. She began working for Dr. Santos at Monte Vista’s sister hospital, Community Veterinary Clinic as a receptionist before moving to Monte Vista to manage the call center. Chasity has worked her way into her current role as the Hospital Site Manager.  Chasity has one daughter, Baylee, who she has the privilege of working with at Monte Vista. The two of them have two dogs and two cats. Chasity is often known by staff to be the one to rescue kitties that have been abandoned, sick, or injured.
Chasity Mendes Hospital Operations Manager
Amy Gannon - Call Center Lead

Amy Gannon

Call Center Lead

Amy is native to the Los Banos area. She has also lived in Sonora, Danville, and Walnut Creek before moving to Turlock. She was a licensed cosmetologist before starting her career at Monte Vista in 2018. Amy has two sons, Preston and Chapman, and three family pets, two dogs and a cat. She loves hiking and exercising and her favorite vacation spot is Monterey.

Tiffany Robinson

Reception Lead

Tiffany grew up in Ceres where she is a proud graduate of Ceres High School. She acquired her CNA license and followed that career path until being hired at MVSAH in 2014. Tiffany started her journey at Monte Vista as a part-time receptionist and earned her way to becoming a department lead. She has five children, one of which she gets to work with. She has two Pitbulls and four cats. Tiffany loves the outdoors and enjoys camping, hiking, and exploring. Additionally, she is studying to be an herbalist.
Tiffany Robinson - Reception Lead (1)
Elizabeth Carreiro - Human Resources Manager

Elizabeth Carreiro

Human Resources Manager

Elizabeth grew up on a sheep ranch in the small California farm town of Riverdale. Right after high school, Elizabeth moved to Turlock to continue her education at CSU Stanislaus. She graduated with her Bachelor’s Degree in Criminal Justice. She started working for Monte Vista in as a Kennel Attendant and then became the department lead before taking on Human Resources. Elizabeth stays busy taking care of her two Australian Shepherds, Bonnie and Jane. She often takes them back to her hometown to run on the sheep ranch.

Jeff Tudor

Pharmacy Lead

Jeff was born and raised in Modesto where he graduated from Valley Charter High School as the Valedictorian in 2007, he immediately became a pharmacy technician. He started his career at Paradise Drugs and Walgreens before transitioning to MVSAH where he was hired as the Pharmacy Lead. He and his husband have two Chihuahuas, Piper and Leona, and two cats, Sabrina and Tofu. Jeff participates in a local vegan group, “So Easy, So Good,” that coordinates gatherings, activism, and events. He is an avid Britney Spears fan, and enjoys fashion, music, and politics. He is a dual citizen in the United States and Ireland.

Jeff Tudor - Pharmacy Lead
Carolyn Kerntke - Reception Lead

Carolyn Kerntke

Reception Lead