Meet Our Veterinary Team
At Festival Animal Clinic, we believe exceptional veterinary care starts with an exceptional team. Our doctors, registered veterinary technicians, veterinary assistants, and client service representatives work together to provide the personal, compassionate, and professional care our Centennial community has trusted for decades.
Every team member brings a unique blend of expertise, experience, and dedication to the pets we serve throughout Centennial, Highlands Ranch, Littleton, Aurora, Denver, and surrounding areas. We are honored to care for your four-legged family members and look forward to welcoming you into our clinic.
Below, we invite you to get to know the people behind the care—our veterinarians and support staff who make Festival Animal Clinic the warm, reliable, and community-focused practice it is today.
Veterinarians
Robert Leenerts, DVM
Dr. Rob Leenerts is a Colorado native and earned his Doctor of Veterinary Medicine degree from Colorado State University in 1986. Upon graduation, he practiced in Northern California for 10 years before returning to Colorado. He has worked at practices in Broomfield, Parker and Lone Tree before having the opportunity to partner with Dr. Knapp in the purchase of Festival Animal Clinic in July, 2012. In the spring of 2009, Dr. Leenerts completed training and certification in Veterinary Medical Acupuncture at the Colorado State University School of Veterinary Medicine. He currently provides medical acupuncture for dogs and cats at our facility and enjoys the interactions he has with the pets and their human companions.
Dr. Leenerts lives south of Parker with his wife, Kay. They have an adult daughter and son and share their home with a menagerie of pets including a Shih-tzu named Micah, a Dachshund/Chihuahua named Gabe and two cats, Mango and Delli. Dr. Leenerts enjoys hiking, camping, biking, playing tennis and participating in the worldwide treasure hunting game of geocaching. He also is a sign language interpreter and provides this service weekly at the church he attends as well as for our hearing impaired clients.
Kathleen Costello, DVM
Dr. Costello has practiced small animal medicine in the Denver Metro area since 2006. She earned her Doctor of Veterinary Medicine degree from Colorado State University after completing a B.A. in Journalism from Colorado State University and an M.S. in Education from Drake University. Prior to becoming a veterinarian, Kathleen worked as an elementary school teacher in Colorado and Nebraska.
Dr. Costello enjoys many aspects of veterinary medicine, but has a special interest in internal medicine, cardiology, and ophthalmology. In her free time, she spends time with her family and furry friends. Dr. Costello, her husband Brian, and their two daughters share a home with 2 Border Collies, Hank and Sullivan, and 4 rescued cats, Finn, Foo Fighter, Little Gray Dude, and Stanley. In her spare time, Kathleen enjoys watching her daughter’s hockey games and tennis matches. Her favorite hobbies are reading and gardening.
Practice Manager
Val Valdez, RVT, Practice Manager
Val was born and raised in New York. After working in busy Manhattan hospitals and emergency clinics upstate, she made her way to colorful Colorado in 2020. With over a decade of experience in this field as an RVT and practice manager, she strives to bring exceptional patient care and treats all of her patients like one of her own.
Her passion for animals started as young as she can remember, always bringing home stray animals or injured wildlife. Patient care and comfortability is what are most important to her, and educating clients to help make the best pet parents. In her spare time, she loves camping, trying new recipes, and live music. When she isn’t busy outdoors, she’s at home loving her Pomsky No Face, Cat Spooky, and Sphynx Mew.
Registered Veterinary Technicians
Yuko, RVT
Yuko was born and raised in Tokyo, Japan, and moved to Cincinnati, OH, with her husband in 1999. She undertook the veterinary technology program at the University of Cincinnati, earned an Associate of Applied Science degree, and became a credentialed technician in 2005.
Upon graduation, her family moved to Colorado, and she started work as a certified veterinary technician in the south Denver area. Yuko has two senior Cavalier King Charles Spaniels, Toby and Emma, plus an 18-year-old cat, Yoda. Yuko’s professional interests include senior care, dentistry, and cardiology. In her free time, Yuko enjoys practicing yoga, going hiking, and skiing along with her teenage son.
Heidi, RVT
Heidi has always loved animals and started volunteering at an animal shelter when she was 14 years old. She graduated from Bel-Rea and became a Registered Veterinary Technician in 2014 and has been in the field ever since. Heidi is a Colorado native and enjoys being outside paddleboarding, hiking, and horseback riding.
Veterinary Assistants
Alia, Veterinary Assistant
Alia grew up in Northern Colorado and moved to Denver for school. She plans to go to school to become a Certified Veterinary Technician. Alia loves spending time outdoors with her dogs, Sydney and Yuma.
Chloe, Veterinary Assistant
Chloe knew from an early age that animals would be in her life. She decided it was a natural progression to make animals her career and became a Certified Veterinary Assistant in 2020, and has loved every minute of it. In her free time, she enjoys traveling, hiking, and spending time with family and friends.
Debbie, Veterinary Assistant
Debbie grew up in Pennsylvania but moved to Nevada when she was 17. Next, she made her way to California and, while there, worked with Dr. Leenerts at 2 different Veterinary practices. Moving to California’s Central Valley, she worked in a Veterinary Orthopedic Surgery Practice. Finally, she found her way to Colorado and joined Dr. Leenert’s practice again. It feels like coming home. Debbie loves animals of all kinds and has had a wide assortment over the years. Currently, she is passionate about dog rescues and gardening.
Client Service Representatives
Karen, Lead Client Service Representative
Karen is a native of Colorado, where she graduated from High School. She has been in the veterinary field since 1992, when she started out working in the kennels at a local emergency clinic. She has been with our team since 1998 as both a receptionist and technician. She enjoys all aspects of her job and especially wants to make sure our clients and patients are happy and comfortable. Karen is married with two grown children and three grandsons. Outside of work, she enjoys the outdoors, hiking with her dog, horseback riding, camping, and travelling.
Debbie C., Client Service Representative
A native of Colorado, she resides in the Centennial area with her husband of over 20 years and her chi-weenie Holden. She loves every aspect of working at the clinic, particularly ensuring clients and their fur babies are promptly and courteously tended to.
Kendal Huevelman, Client Service Representative
Kendal is from Arvada, Colorado, where she currently lives with her loving husband. Kendal been a lover of animals as far back as she can remember and takes priority in ensuring our clients and their pets receive the best care and experience possible. She proudly has 2 kitties and a silly Australian Shepard named Zoey. In her free time, she enjoys being a mommy to 2 wonderful young boys, reading, cooking, traveling, and spending as much time as she can outdoors with friends and family.
Dedicated to Caring for Pets Across Centennial, CO
Our team is united by a shared commitment to providing the highest standard of veterinary care with kindness, integrity, and compassion. We are proud to serve pets and their families throughout Centennial, Highlands Ranch, Littleton, Aurora, Denver, and surrounding areas.
Whether you’re visiting us for preventive care, surgery, diagnostics, or senior wellness, you can feel confident knowing your pet is cared for by a knowledgeable, experienced, and wholeheartedly dedicated team.
