Equine Staff

Equine Veterinarians

Martin G. Crabo, DVM
Co-Owner of Chaparral Veterinary Medical Center
Equine Sports Medicine
Equine General Practice

Dr. Crabo joined Chaparral Veterinary Medical Center in 1991. He graduated from the University of Minnesota, College of Veterinary Medicine in 1990 and subsequently completed an internship in Large Animal Medicine & Surgery at Washington State University. Dr. Crabo is married to Barbara, an Eventing Trainer having completed the prestigious Rolex Kentucky CCI****. Together they have a daughter named Jordan (also an avid Eventer), 14 horses, 3 dogs, 3 cats and a Cockatoo on their "ranch," Four Peaks Farm. When the family gets a rare chance to get away, the Crabos enjoy horse shows, snow skiing, and the ocean together. Professionally, Dr. Crabo's interests include equine sports medicine, lameness, and imaging as well general equine practice. He strives for an in-depth knowledge of equine ultrasound and anatomy through his membership in ISELP, the International Society of Equine Locomotor Pathology.
C. Renee Andrea, DVM, DACVS
Diplomate of the American College of Veterinary Surgeons (Large Animal)
Co-Owner of Chaparral Veterinary Medical Center
Equine Surgeon
Equine Sports Medicine
Dr. Andrea was born and raised in the state of Washington where she held her first job cleaning kennels at the Gig Harbor Veterinary Hospital. She obtained her Associates Degree in Animal Health Technology and worked her way through college as a Certified Veterinary Technician. She then attended Washington State University where she graduated with a B.S. in Animal Science in 1990, and her DVM, with honors, in 1994. Dr. Andrea came to Arizona to complete an internship at Arizona Equine and thereafter, completed a residency in equine surgery at the University of California, Davis. She earned her Diplomate status as a Board Certified Equine Surgeon in 1999. Dr. Andrea joined Chaparral as an equine surgeon in 2001 and became a partner in the practice in 2003. She was grateful to help build the referral and surgical portion of the practice and the transition into Chaparral Veterinary Medical Center in 2008 was a dream come true. She has enjoyed growing with the practice over the years and continues to be a huge part of the Chaparral team.
Dr. Andrea has published research in equine orthopedics, as well as soft tissue reconstructive surgery. She specializes in all areas of lameness, sports medicine, and surgical conditions of the horse. Training in the southwest solidified her love of the acute abdomen (surgical colic), but her true passion is orthopedic and reconstructive surgery. Dr. Andrea brings a unique perspective to diagnosing and treating conditions of the equine athlete, being a barrel racer herself and having years of experience working on horses from all disciplines with performance-limiting lameness issues. She strives to provide the most cutting edge treatment modalities to her patients, staying current with advances in regenerative medicine and combining these treatments with surgical therapy when needed.
Dr. Andrea and her family (husband Mike Freeland, and sons Canon and Shea) currently have 9 horses that complete their rodeo team. When not making a run herself, she is keeping the rope horses working.
Rachel Liepman, DVM, MS, DACVIM
Diplomate of the American College of Veterinary Internal Medicine (Large Animal)
​​​​​​​Equine Internal Medicine
​​​​​​​Neonatal Foal Care

Dr. Liepman joins Chaparral from the Midwest, hailing from Michigan. She grew up on a Thoroughbred hobby farm in New England and discovered her passion for horses riding hunter/jumper horses. She traveled the east coast and throughout the midwest during college showing jumpers on the A and AA circuit. A Wolverine at heart (her alma mater), Dr. Liepman graduated in 2011 from Michigan State University, College of Veterinary Medicine with honors and a Doctorate of Veterinary Medicine. She then completed an internship in equine sports medicine, surgery and internal medicine at BW Furlong and Associates in New Jersey. Thereafter, she accepted a position at The Ohio State University, College of Veterinary Medicine for further training as an equine internal medicine specialist. She became board certified in equine internal medicine and dually received a master of science degree in comparative veterinary medicine from The Ohio State University, studying the effects of intravenous antibiotics on the gastrointestinal health of the horse. Dr. Liepman has published in several different areas in equine medicine including topics in neonatology and gastrointestinal health.
Dr. Liepman especially enjoys equine neonatal care, challenging cases and working up critical emergencies. She spends her free time exploring and enjoying the outdoors with her husband Daniel, her son, Quillen, her daughter, Stori and their dog, Penelope (blue heeler).
Christine Moyer, DVM, MS, DACVS
Diplomate of the American College of Veterinary Surgeons (Large Animal)
Equine Surgery and Critical Care interest
Dr. Moyer grew up in Kansas showing hunter/jumper horses, and continued to ride on the Kansas State University NCAA Equestrian Team. She completed her undergraduate degree and veterinary school at Kansas State University, graduating summa cum laude in 2013. Dr. Moyer completed her internship at Rood and Riddle Equine Hospital in Lexington, Kentucky focusing in surgery, internal medicine, and anesthesia. She then completed a second internship in internal medicine at Marion duPont Scott Equine Medical Center in Leesburg, Virginia. She stayed at Marion duPont Scott EMC for her surgical residency until its completion in the summer of 2018. Concurrent with her surgery specialty training, she completed a master's degree focused in equine wound healing. Dr. Moyer has been a part of the team at Chaparral Veterinary Medical Center since July of 2018 and is eager to be a part of the Arizona community. Her clinical interests include a wide variety of emergency, critical care and surgical conditions, with a special interest in critical emergencies and triage care. She also has an interest in equine sinus pathologies and lameness. In her spare time, Dr. Moyer enjoys spending time with her husband, Chance, and German Shepherd, Docker.
Elyse Durket, DVM
Equine Surgery and Sports Medicine interest

Dr. Durket is originally from Ohio where she had her first job working with small animals and shadowed an ambulatory veterinarian as a high schooler. She went off to Miami University and got a bachelors degree in zoology. She also met her husband and became a “Miami merger.” After undergrad, she achieved her lifelong dream of becoming a true Buckeye. She graduated veterinary school from The Ohio State University. She came to Chaparral Veterinary Medical Center and discovered her love and passion for equine surgery during her internship. She then pursued further training at the University of Florida with an internship in surgery and sports medicine. After her year in Florida, she returned to the Midwest to complete a surgical residency at Iowa State University. She has a passion for lameness, sports medicine and colic surgery. She has published research in both orthopedics and post-operative colic management. Dr. Durket has a passion for horses and aspires to have a horse of her own soon; in the meantime, she is currently exploring which discipline is her favorite. She also may be a low- key crazy cat lady.

Karin Thomasson, DVM, CVA
Equine General Practice
​​​​​​​Certified Veterinary Acupuncturist

Dr. Karin Thomasson was raised on a farm in the great state of Minnesota, where her love for horses and the outdoors began. She waited seven long years to get her first horse and then spent much of her time growing up horseback—training, trail riding, showing, and roping. Dr. Thomasson attended North Dakota State University as an undergraduate, majoring in Animal & Range Science and Equine Studies. To gain additional experience, she worked as an intern at Peterson & Smith’s Equine Reproduction Center in Ocala, Florida, which clinched her desire to pursue equine veterinary medicine. Dr. Thomasson then attended Kansas State University for veterinary school. Go Wildcats! Upon graduation she moved to Glenwood Springs, Colorado completing an equine veterinary internship at Glenwood Veterinary Clinic. She joined the team at Chaparral Veterinary Medical Center in 2015 as an Associate Veterinarian. She enjoys all aspects of equine practice, especially, dentistry and sports medicine. From 2017-2018, Dr. Thomasson pursued a rigorous training program in animal acupuncture and is excited to be certified and now offer acupuncture services for horses and small animals. In her free time, Dr. Thomasson enjoys horseback riding and training, hiking, traveling, and anything outdoors.

Anastasia Keyser, DVM
Equine General Practice

Dr. Anastasia Keyser joins Chaparral from Texas. Although she did not get the opportunity to grow up on a ranch, her family always had horses. She was riding before she could walk and continues to maintain that passion for horses. Dr. Keyser initially received a BA in business administration majoring in business management. Her decision to pursue veterinary medicine followed a few years later after realizing that she wanted to do even more to help horses besides training them and running a 501(c)3 horse rescue. She attended Texas A&M University’s College of Veterinary Medicine and Biomedical Sciences. During her time in College Station, she was employed in the large animal ICU at Texas A&M Veterinary Medical Teaching Hospital. After veterinary school, she completed an internship at Reata Equine Hospital in Weatherford, TX. Dr. Keyser is an equine general practitioner who provides ambulatory and in-clinic services. Dr. Keyser enjoys all aspects of equine medicine with a special interest in dentistry, reproduction, and sports medicine/podiatry. She currently owns 7 horses and 3 dogs. Dr. Keyser often spends her free time trail riding, hiking, camping, scuba diving, skiing, traveling, and competing in horse shows.
Danye Enniss, DVM
Equine Veterinary Intern

Dr. Danye Enniss grew up in rural Northern Nevada and spent her time rodeoing, showing animals in 4-H and FFA, and any other outdoor activities she could do on the Nevada BLM in her backyard. While attending Colorado State University Pueblo for her BS in Biology she worked at a farm and also at a mixed animal veterinary clinic as a receptionist. She graduated from Washington State University's College of Veterinary Medicine with her DVM degree in May, 2019, and joined CVMC as an Intern Veterinarian in June. Her favorite hobby is team roping, and she is happy to be back living in the desert! She is excited to be a part of the CVMC team and is ready to provide top-quality care for your equine pals!

Brianna Valensin, DVM
Equine Veterinary Intern

Bree Valensin grew up in California on a cattle ranch where she learned to ride before she could walk. When she wasn't ranching, she was showing cutting horses with her family. For many years Bree and her family (both two and four-legged) lived on the road traveling from show to show and hauling for year-end awards. it was here that her love for the equine athlete blossomed. Bree furthered her career by moving to Texas where she could be at the center of the horse world. There she finished her undergraduate training at Tarleton State University before attending Midwestern University's College of Veterinary Medicine in Glendale, AZ. Dr. Valensin graduated in May, 2019, and joined Chaparral as an equine intern. Her interests include an extreme love for sports medicine, rehabilitation, and managing colic cases. When Dr. Valensin isn't hard at work, she she enjoys hanging out with her Belgian Malinois, Audie, hiking, exploring Arizona and eating out (mainly because she is a terrible cook.)

Jared Oldham, DVM
Equine Veterinary Intern

Jared Oldham spent the majority of his childhood in his father’s veterinary clinic on the Navajo Nation reservation but now claims Lander, Wyoming as home. Growing up in his father’s veterinary clinic fueled his passion of caring for livestock and horses. Jared’s family owns and operates Double D Ranch which consists of 500 commercial cows, 12 brood mares, 60 show sheep and the Wind River Wild Horse Sanctuary. As a Wyoming FFA State Officer he also grew a great passion for the people in agriculture.

Jared received Bachelors in Animal Science from Kansas State University while competing on their collegiate Livestock Judging Team, #goCATS. He recently completed veterinary school at Washington State University, graduating with a Doctorate of Veterinary Medicine. Jared’s medical interests include theriogenology, sports medicine, and surgery. He plans to eventually return to Wyoming to practice rural veterinary medicine with a focus on large animal and equine medicine. He enjoys the ranch life, the outdoors, sports and mentoring/coaching young FFA and 4-H members.

J Brent Rollins, DVM Emeritus
Dr. Rollins originally founded Chaparral in 1971 and retired at the end of 2012 after 45 years as an active practicing veterinarian. He is a 1967 graduate of Colorado State University where he received his DVM. He grew up in Phoenix, attending Osborn grade school, Washington High School and Arizona State University. His interest in horses came from his dad's Thoroughbred Racing Business (started on the end of a pitchfork and ended up with a trainer's license before Vet School).

After receiving his DVM, he served for three years as a captain in the US Army in Fort Detrick, MD. After the service, Dr. Rollins completed an Equine Internship at the University of California, Davis, Veterinary Teaching Hospital. In July 1971, he entered private equine practice in North Phoenix.
Dr. Rollins feels his greatest accomplishment is his family. Brent and Francie have been married since June 1st, 1963. They have five children and 25 grandchildren (at last count) and his days of retirement were spent keeping up with all their activities.

Dr. Rollins will be missed and forever memorialized as a part of our team at Chaparral. He passed away on January 27, 2018 surrounded by his loved ones.

Equine Technicians

Brooke Taranton
Clinical Operations Manager
Inventory Manager
Originally from San Diego, Brooke is a veteran member of the Chaparral team and has been with us since October 2008. Brooke is our clinical operations manager and also manages our pharmacy and inventory. She has gracefully stepped into this role and has remained a leader of the team, training others in anesthesia and day to day operations. Her love of horses began at the age of 3 and she has made horses her life. In her work life, she most enjoys the challenges of organizing the work flow and helping out where needed-she can always figure out a way to help. She loves to ride her horses and enjoys the comic relief of her donkey, Amos. She also has a soft heart for dogs. Needless to say, furry creatures have stolen her heart.
Krista Dupree
Imaging and Equipment Specialist
Equine Anesthesia Technician

Krista is an Arizona Native with a passion for horses for as long as she can remember.  Krista has been with Chaparral since 2011.  She is an equine anesthesia technician, she manages the equipment needs of the clinic and she runs the imaging department at the clinic.   She is married and has three dogs and a horse.  She loves caring for rescue animals and every year she heads the Holiday Pet Festival hosted by Tranquility Trail Animal Sanctuary.
Emily Barrett
Equine Medicine Technician
Emily grew up in the small town of Bull Valley, IL. She's been involved in the horse industry since she was 6 years old, starting with riding lessons and eventually spending every free second at the barn. Emily graduated in 2014 from William Woods University with a B.S. in Equine Science Equestrian Administration. She went back to Illinois after graduation and worked as an assistant barn manager at a local lesson barn, training horses on the side. In November of 2016, she found herself moving out to Arizona and got a job as a large animal technician at Chaparral. She spent some time as an ambulatory tech before moving in the hospital as the medicine technician. In her free time, Emily enjoys spending time with her Paint horse, Cruise, and her German Shepherd, Zazu. During the months when it's tolerable to be outside, you can find Emily hiking, trail riding, or just spending time outdoors.
Camila Reyes
Barn Nurse
Equine Anesthesia Technician
Camila was born and raised in Caborca, Sonora, Mexico. She attended veterinary school at Universidad del Valle de Mexico in Hermosillo, Sonora and graduated in December of 2017. She has always loved animals, mostly dogs and horses. She completed an equine externship at CVMC for 20 weeks over a year ago and we couldn't let her leave, we loved her so much. She has two dogs: a Shih-Tzu, and a Scottish Terrier (Sushi and Renata). She enjoys many aspects of equine medicine and has worked extensively with neonatal foals, surgical cases and she is now able to run equine anesthesia as well. In her free time, she likes to travel and spend time with friends and family.
Robyn Reed
Equine Anesthesia Technician

Gina Stratton
Equine Ambulatory Lead Technician
Gina was born in Big Spring, Texas. She grew up riding and showing in 4H and spent most of her life on racetracks, holding different positions at each one. This allowed her to travel to new places quite frequently. She misses the racetrack every single day, but when her son started high school, it was time to stop the nomad life. She took the opportunity to become an equine ambulatory technician at CVMC starting in 2016. She still spends many weekends at the track. For Gina, there is nothing like making a difference in a horse's life. 
Ally Hack
Equine Ambulatory Technician

Allie grew up in Wheaton, IL. She fell in love with horses at 8 years old after spending the summer at camp, Black River Farm and Ranch, and they have been a huge part of her life ever since. She moved to Arizona in 2012 and received her bachelors degree in biological sciences from Arizona State University. Allie loves spending time with her family and three dogs and enjoys hiking, camping and traveling.
Kristin Wurtz
Equine Ambulatory Technician
Kristin was raised in Alamo, Nevada with a passion for competition and performance horses. Growing up she competed rodeo in events such as goat tying, breakaway, and barrel racing. She pursued higher education with rodeo scholarships first in Wyoming and then at New Mexico State University where she earned her bachelor's degree in Animal Science. She has a soft spot for bay horses and mutt dogs. In her free time, Kristin enjoys barrel racing, roping, building mohair tack, traveling, cooking, and doing anything outdoors. She has a "wheeler" (1/2 dotson 1/2 heeler) dog named Willa.


Brandt Cassel
Practice Administrator​​​​​​​
Brandt is originally from Southern California and has spent many years in healthcare management and operations positions. He has a BS in Organizational Management from the University of La Verne, and an MBA in Healthcare Administration from the University of Saint Mary. Brandt enjoys spending time with his dogs Elvira and Larry, and Lemmy the Cockatiel. He and his beautiful wife, Heather, enjoy beach camping and spending time with their two lovely granddaughters.
Holly Taranton
Practice Representative

Holly is a pivotal part of the Chaparral team as a practice representative and master of many things. She has a long history of administrative work in the legal, real estate development, construction and shopping center management industries and has always had a love of animals. She started off her oldest daughter at the age of 3 riding horses and her love of horses continued with her other 2 daughters. She now enjoys spending time with her husband, 3 grown daughters, her grandson and their many rescue dogs and horses. She, her husband, middle daughter, and grandson recently moved back to the United States from living in Melbourne, Australia.
Suzan Rockvam
Accounts Receivable Specialist

Suzan is originally from central California, but she has lived in the Scottsdale area for decades. She has always had a passion for animals and raised poodles and Lhasa Apsos in the past. She satisfied her equine passion by completing the Equine Science program at Scottsdale Community College resulting in a degree in Equine Science. Suzan spent many years as the office manager at Southwest Equine Hospital in Scottsdale. She was also employed in administrative positions in retail, real estate, health care and she now has returned to the veterinary world. She is the proud owner of 2 rescue dogs: Sally (a jet-black corgi mix,) & Sunny (a buff cockapoo mix.) Her many hobbies include fitness, music, and travel, but she spends most of her time enjoying her home and teenage son, Robert.
Merle Black

Merle recently came to Chaparral Veterinary Medical Center as our new bookkeeper. She recently moved to Arizona from Southern California after many years working in the non-profit sector. The need to assist our fellow man and four-legged friends never leaves our heart, which makes Chaparral a perfect fit for her.
Amy Goda-Dieguez
Barn Assistant​​​​​​​

Amy has been working with horses for 29 years in many different venues and has been fortunate to have traveled around the United States and the world. She started out working with and riding racehorses and her dream has always been to help care for horses. Amy also loves working with a passionate group of people who love what they do. She enjoys spending time with her wonderful daughter, Mae, and husband, Wilson, who also works at CVMC. 

Consulting Veterinarians

Zoe ReedEye Care for Animals
Eye Care For Animals
Joanna Norman DVM, DACVO

Dr. Norman graduated from St. Andrew’s Presbyterian College majoring in both Biology and Chemistry. Prior to veterinary school, she worked in a large equine clinical and research facility in Southern Pines, North Carolina, where she gained valuable experience in clinical research. She also externed at the National Institute of Environmental Health Sciences and worked with a team of oncologists, researching squamous cell carcinoma of the skin. She then received her Doctorate in Veterinary Medicine in 2002 from North Carolina State University College of Veterinary Medicine.

After graduation, Dr. Norman completed a private practice rotating internship in small animal medicine and surgery. For two years prior to beginning her residency she continued as a small animal and exotics general practitioner in Albuquerque, New Mexico. Dr. Norman joined Eye Care for Animals in 2005 and completed her three-year residency in veterinary and comparative ophthalmology. In 2008, she was named Eye Care for Animals’ Resident of the Year. She became board certified and achieved Diplomate status in 2009. Dr. Norman has published literature in both national and international journals of veterinary medicine. Her primary clinical interests are in the management of ocular disease in the horse and corneal and cataract surgery in all species.

Zoe ReedEyeshine Veterinary
Eyeshine Veterinary

Dr. Reed is one of less than five-hundred veterinary ophthalmologists certified by the American College of Veterinary Ophthalmology in the world. Dr. Reed recently opened Eyeshine Veterinary: Arizona’s only locally-owned, independent ophthalmology-only practice treating ‘anything with eyes’ in Phoenix. She treats small patients at Eyeshine and provides ophthalmology services for horses both at local equine hospitals and in-the-field. In addition to seeing patients, she has authored a number of journal articles and continues to participate in clinically-focused research. Dr. Reed attended UC Davis for her DVM degree and completed her comparative ophthalmology residency here in the Valley of the Sun. Experience working in various ophthalmology practices and multi-specialty veterinary hospitals in the western United States inspired Dr. Reed to start her own veterinary ophthalmology practice where she can create an environment focused on caring for animals and the people who love them.