Meet Our Team


  • Dr.
    Mark Sargent

    Oregon State University / Washington State University, DVM 1984

    Dr. Sargent was raised in Central and Eastern Oregon, graduating from Heppner High School. In 4-H, Mark’s primary project was sheep, having a flock of ewes and raised lambs each year. Due to a strong interest in why his lambs would get sick, he decided to become a veterinarian. After graduating from veterinary school, Dr. Sargent joined the Oregon Trail Veterinary Clinic as a mixed animal practitioner. He has recently been spending a greater amount of time in small animal practice, taking special interest in dermatology, senior care, and dentistry. In his off-time, Mark enjoys Bible study, volunteering at his church, white water rafting, and home improvement projects. He is married and has two sons: Ben,  and Tim.

  • Dr.
    Brent Barton

    Oregon State University / Washington State University, DVM 1988

    Dr. Barton has been in the practice for 25 years. In 1988, he graduated from Veterinary School at Oregon State University. From 1991 to 1993, he served in the US Army Veterinary Corps, as a part of Operation Desert Storm. Dr. Barton has had mixed animal practice experience previously in Burns, Oregon and Three Forks, Montana. The most important things in his life are faith, family and or course fun. He enjoys spending time fishing and doing other outdoor activities. When it comes to veterinary medicine, Dr. Barton is especially interested in small animal medicine, ultrasonography, equine critical care, bovine reproduction, draught horses and senior dog and cat care.  Dr. Barton has 3 cats and 2 dogs, a mule, two horses, and a few pet cows at home.

  • Dr.
    Eugenio Mannucci

    University of Idaho / Oregon State University, DVM 2015

    Dr. Mannucci was born and raised in Rome, Italy, until 2009 when he received an athletic scholarship to University of Idaho (U of I). While obtaining his Bachelor in Animal Sciences he competed on the Vandal Track and Field Team where he became an All-American Shot Putter, received the Stan Bates Award (an award given to the top male athlete in the Western Athletic Conference for outstanding academics), and Pre-Veterinary Student of the Year. He then attended Oregon State University College of Veterinary Medicine and graduated in 2015. Along with his DVM he is a certified Veterinary Medical Acupuncturist for large and farm animals. Dr. Mannucci enjoys all aspects of the veterinary profession but is especially interested in equine; reproduction, lameness, acupuncture, dentistry, emergencies, and all types of surgeries. After graduation he worked at an equine hospital and rehabilitation center in Decatur, Texas, where he treated colics both medically and surgically, equine reproduction (semen collection, insemination of mares, embryo transfers, assisted foaling, and performed foal wellness exams), lameness, laceration repairs, equine ultrasound, acupuncture, and all areas of equine medicine. Being an athlete himself he loves to help animals perform at their highest potential all while feeling their best. His approach to a diagnosis is one that requires the same determination. In Dr. Mannucci’s free time he enjoys spending time with his family, all sporting activities to stay healthy, and traveling. He is excited to be a part of Oregon Trail Veterinary Clinic’s team and looks forward to having your animals feeling and performing their best.

  • Dr.
    Jana von Borstel

    Oregon State University, DVM 2016

    Dr. von Borstel grew up on a wheat and cattle ranch in Grass Valley, Oregon. Growing up on a ranch allowed Jana to develop a strong passion and background for working with cow/calf operations ,working ranch horses and all manner of pets. Jana attended Oregon State University for her undergraduate studies receiving an Honors Bachelor of Science in Animal Science. She continued on at OSU to receive her Doctorate in Veterinary Medicine and she also received certification in acupuncture for both small as well as large animals via the Chi Institute in Florida. After receiving her DVM, Jana worked at a mixed animal clinic in Goldendale, Wa. Jana is excited to be in the Hermiston area as it allows her to be closer to family, friends and pursue her hobbies like horseback riding and helping out on family cattle operations.

Practice Manager

  • Sara Shoemake

    Sara was born in Dallas, OR and grew up here in Hermiston. Sara joined the OTVC family in Oct. of 2006 where she started as a Veterinary Assistant and quickly moved on to Technician training. From there she started expanding her knowledge and diversity and took over Inventory control as well as Head Tech and is now the Practice Manager and oversees and manages the whole clinic. She loves animals…ALL of them. She has horses, a miniature horse, miniature donkey, parrot, chickens, rabbit, cats, Ball Python, dogs, a goat and a husband. She enjoys breeding, raising and training her horses and horseback riding. She is a member of Umatilla Sage Riders and enjoys competing in Ranch Sorting and Team Penning. She is also involved with Special Olympics where her brother is a very active team member and she enjoys singing on her churches worship team. “My nephew lives with us and my husband and I really enjoy watching how he’s growing up into such a great young man. After spending time at OTVC now he’s considering a career in the Veterinary field. He’s so amazing and we are so proud of him! I love my OTVC family because that is truly what we are, a family. I could never dream of working anywhere better”


  • Jakki Long

    Jakki Long was born and raised in Hermiston, OR. She has always had a passion for helping animals. Growing up, she was often taking in stray dogs and cats, pet sitting for neighbors, and helping her family breed and raise Labrador Retrievers. She always knew she wanted a career in veterinary medicine and in 2006 she got an opportunity to fill an internship position at OTVC. Afterwards, she was trained to be a veterinary technician. In December 2009, she took on a new position as our receptionist and that’s where she really found her place. As a mother of two, Jakki enjoys spending time with her family from kayaking and fishing to swimming and bbqing. “Being OTVC’s receptionist is the best job in the world! I love being able to interact with not only the pets, but their owners as well and create and build some wonderful relationships that I will always cherish.”

  • Codi Warren

    Codi was born in La Grande, OR and was raised here in Hermiston, OR. She has always had an interest in animals, especially dogs, cats, and horses. She has a Great Dane and two cats. She enjoys hiking, especially in the Columbia Gorge. She also loves exploring the great outdoors and camping on the weekends, riding four-wheelers, reading, and spending time with her friends and family. “I love my job here at the clinic because it allows me to become more knowledgeable about animals in their treatment and care in every stage of life. I enjoy interacting with the pets and their owners. I truly believe that I have found the job for me!”

Certified Veterinary Technicians

  • Joellyn Herriman

    Joellyn grew up in La Grande, OR. She went to Eastern Oregon University and received her Bachelor’s in Agricultural Business Management through OSU. While there she was on the Collegiate Polo Team all 4 years. After graduating, Joellyn spent a year in Kentucky working on a thoroughbred horse farm and working at Hagyard Equine Medical Institute. These experiences spurred her into pursuing a degree in Veterinary Technology at Yakima Valley Community College. Joellyn joined the OTVC family in 2011. In her off time, Joellyn and her husband enjoy white water rafting, hunting, and horseback riding. They recently welcomed a new baby boy and made their family and beautiful family of three.

  • Rebecca Samuelson

    Rebecca (Becky), grew up in Hermiston, OR. She moved to St. Louis after graduating High School and, after a lot of hard work, graduated a Certified Veterinary Technician. After working in an emergency/surgical animal hospital in St. Louis, Becky moved back home to Hermiston where she became part of the Oregon Trail Veterinary Clinic family. Becky loves spending time with her kids, hiking, camping and pretty much anything outdoors.

  • Jeanne Jones-Gieke

    Bio under construction

Veterinary Technicians/Assistants

  • Jami Erwert

    Bio under construction...she got bucked off again.

  • Heather Plate

    Bio under construction

  • Molly Dale

    Bio under construction

  • Kalley Dean

    Bio under construction