Meet Our Team

Owners and Founders

Kristina (Keena) Van Horn, DVM, CVA

Co-Founder

Dr. Keena Van Horn brings more than three decades of veterinary expertise to Shenandoah Veterinary Associates, with a career spanning primary care, emergency, and referral medicine. A graduate of Cornell University’s College of Veterinary Medicine, she began her career in mixed animal practice in New York before transitioning to small animal primary care and emergency medicine in Washington State.

For nearly twenty years, Dr. Keena co-owned Woodside Animal Hospital in Port Orchard, WA, where she doubled the practice’s caseload, led multiple facility remodels, introduced new services, and championed Fear Free handling techniques long before they became standard. Her leadership extended beyond medicine—mentoring young veterinarians and students, shaping client education programs, and guiding her team through both economic challenges and growth.

In 2017, she and her husband, Dr. Michael Van Horn, relocated to Virginia, where she has provided relief veterinary services for numerous clinics in the Roanoke and Lexington areas while dreaming of opening her own emergency hospital. Known for her compassionate, thorough approach, Dr. Keena has a special interest in behavioral medicine, internal medicine, and ophthalmology, and she is particularly fond of working with cats—though dogs are equally welcome patients in her care. She has also completed specialized training in acupuncture and endoscopy.

Outside of the hospital, Dr. Keena is a breeder of Russian-Polish Arabian endurance horses and enjoys endurance riding, dressage, photography, reading, writing, and exploring antique malls. She and Dr. Mike are delighted to call Virginia home, where they have built a horse farm and a wonderful life providing care for the Roanoke animal community.

Michael (Mike) Van Horn, DVM

Co-Founder

Dr. Mike Van Horn brings a lifetime of diverse experiences to his work in veterinary medicine. Before earning his DVM from Oklahoma State University in 1993, he spent time as a commercial fisherman in Alaska and completed a veterinary preceptorship in Te Awamutu, New Zealand. While abroad, he embraced the local culture, food, and breathtaking landscapes of both the North and South Islands—though he’ll tell you he never spotted a hobbit.
 
After graduation, Dr. Mike began his career in mixed animal practice, treating everything from dogs and cats to horses, goats, cows, and pigs. It was during this time that he met his future wife and professional partner, Dr. Keena Van Horn. A few years later, they moved to Washington State to focus on companion animal medicine and eventually owned a thriving general practice for nearly two decades. Their hospital was voted “Best in Community” for more than 10 consecutive years, a reflection of their commitment to making veterinary visits less stressful for pets, pet parents, and team members alike.
 
A former multi-sport team captain in high school and college, Dr. Mike brings strong leadership, collaboration, and clear communication to every case. He values working closely with pet families, referring veterinarians, and his medical team to ensure each patient receives the very best care.
 
Dr. Mike’s clinical interests include surgery, endocrinology, and internal medicine. Outside the clinic, he enjoys hiking, camping, traveling, and chasing new adventures—whether zip lining, scuba diving, or bungee jumping. At home, he loves snuggling with his dog Kurosawa, and is endlessly amused by his dog Wasabi’s exceptional popcorn-catching skills (and Sake the Sheltie’s complete lack thereof). Over the years, many rescue cats—with some help from Dr. Keena—have also trained him well in the art of feline appreciation.
 
Mike and Keena are the proud parents of three adult daughters who share their love of animals, great food (especially sushi), and exploring new places.

Administration

Crystal Mason

Director of Operations

A Roanoke, Virginia native, Crystal Mason brings more than 20 years of clinical expertise and healthcare leadership to Shenandoah Veterinary Associates. Before transitioning into healthcare technology and operations, she spent over 16 years as a clinician in the eye care field, building a strong foundation in patient-centered care and team collaboration.

Crystal’s career took a dynamic turn at Lumata Health, the country’s first tech-enabled ophthalmology care management startup. There, she played a pivotal role in architecting scalable operational frameworks from the ground up—helping expand the organization from 8 to more than 130 team members in just two years. She integrated innovative technology solutions and leveraged data analytics to improve patient outcomes, streamline workflows, and elevate operational efficiency.

She later served as Manager of Care Management at TimeDoc Health, where she led remote care teams and supported strategic growth initiatives during the company’s recognition as one of Time Magazine’s Top 100 Tech Healthcare Organizations in the World.

Crystal is energized by the opportunity to help build Shenandoah Veterinary Associates from the ground up. She brings proven expertise in scaling startups and orchestrating organizational excellence, and she is passionate about elevating emergency and specialty pet care while fostering a positive, compassionate workplace culture—for both the animals and the people caring for them.

Outside of work, Crystal enjoys spending time with her family and her three dogs—Hank, Indiana, and Lincoln. An avid football fan, she proudly cheers for JMU, Virginia Tech, and the Philadelphia Eagles.

Amanda (Mandi) Womble

Director of Nursing

With two decades of experience in veterinary medicine, Licensed Veterinary Nurse Mandi Womble brings deep expertise and an unwavering passion for Emergency & Critical Care. She understands how overwhelming a trip to the ER can feel, and she takes pride in caring not only for her patients, but also for the families who love them. Her calm, reassuring presence helps clients feel supported, informed, and never alone during stressful moments.

Although Mandi is energized by leadership, coaching, and team development, she remains as hands-on as ever. You’ll often find her on the treatment floor—comforting pets, assisting with critical cases, and working side-by-side with her team to ensure every patient receives exceptional care. For Mandi, emergency medicine is the perfect blend of clinical skill, teamwork, and genuine heart.

Outside of the hospital, Mandi enjoys spending time with her family and staying active in her local community. She brings that same warmth, dedication, and steady support to every pet and person who walks through our doors.

Mandi looks forward to caring for your pets like family and helping make your emergency visit as smooth and reassuring as possible.