Meet Our Veterinary


in Englewood, CO

We look forward to seeing you soon! Get to know the amazing team at Cherrelyn Animal Hospital and why we love what we do so much.

A Dog With Brown Collar

Our Veterinary Team at Cherrelyn Animal Hospital

We invite you to meet the veterinary team at Cherrelyn Animal Hospital and see for yourself the high level of expertise and compassion we bring to every appointment.


Dr. Gerald Koster

Gerald Koster, DVM – Medical Director

Dr. Koster has been the Medical Director of Cherrelyn Animal Hospital for 30 years and has loved every single day of it. Having performed over 35,000 surgeries and seen over 150,000 patients in his veterinary career, he has certainly found a drive and passion for animals of all shapes and sizes. Offering a full range of diagnostic, treatment, and overall medical protocols, Dr. Koster has refined the science, art, and practice of the finest medicine in the state. Dr. Koster has traveled all over the country, even the world, gaining education and training in some of the most refined advances of Veterinary medicine as well as dedicating much time and study to the oldest and most effective forms of treatment available. The love and passion he has for veterinary medicine in the Cherrelyn/Englewood community is remarkably well-known and has become a standard for the care and treatment of every patient and client. He loves his 2 beautiful granddaughters and building intricate Legos.

“My whole life, I have wanted nothing more than to share the knowledge I have in order to help treat patients in need. I desire to serve our patients and clients with excellent medicine, great customer service, and reasonable costs in order to provide the best care possible and build a standard of veterinary treatment that meets and exceeds expectations. I have a lot of fun with our staff, our patients, and our clients; I could not imagine a better way to live life than by serving our patients and clients the way we have for so many years.”
-Dr. Koster

Dr. Ryan Waznik

Ryan Waznik, DVM – Veterinarian

Dr. Ryan Waznik has been practicing for three years and graduated from the University of Georgia. He takes pride in offering the highest quality medicine for every patient while acknowledging the goals each client has. Dr. Waznik tries to provide the most up-to-date information and treatment options to allow clients to make informed decisions. His specific areas of interest are surgery, preventative medicine, and client education.

In his free time, he likes to spend time with his wife and two daughters (Tatum and Aspen) and two Labradors (Luke and Luna). He enjoys spending time outside hiking, skiing, fishing, and traveling. He also loves watching the DAWGS win back-to-back national championships!

Administrative Team

Jason - Hospital Manager
Jason, RM, RVT, BS - Hospital Manager

Jason King has been in the veterinary medical and technology field for over 20 years. Starting out early in life with various animal volunteer positions, shelter organizations, and even a background in foreign/overseas animal care/study, he began an almost instant interest and passion for the care and wellbeing of animals of every kind. With extensive experience in animal medicine and treatment, animal forensic study, and a successful business career/understanding, Jason King has become the Practice Director of Cherrelyn Animal Hospital, a wonderful practice with a proven 65-year reputation for providing excellent patient treatment and services. Jason and Tami are high school sweethearts with a slightly different story than most. Tami grew up in Hawaii, while Jason lived in Santa Monica, California, and later Parker, Colorado. Tami was born on the island of Oahu and spent her life caring for and raising a numerous variety of animals and pets, while Jason, as well, was raised in a family with a fond love of rare and exotic animals (with the occasional dog and cat too). Traveling the world as a teenage surfer, Jason met Tami in Hawaii, and it was love at first sight. The two spent the next several years finishing high school, college, and service missions, all while maintaining a fond love for each other and an ever-growing interest in animal care, behavior, and medical treatment. Happily married for over 10 years, and with the help of their first child, Diamond, Jason, and Tami have now devoted their professional lives to the care, treatment, and well-being of thousands of animals statewide.

Dillon - Assistant Hospital Manager
Dillon - Assistant Hospital Manager

Dillon has been at working at Cherrelyn for almost 10 years! He takes pride in educating clients, making sure they understand everything and have no more questions before they leave. He thrives on making sure every client and patient feels welcomed and comfortable in the clinic. He most enjoys spending time with his fiance’, Destiny; in their free time, they like to participate in indoor bouldering, hiking with their dogs, and exploring new places/activities.


Allison - Veterinary Assistant
Allison - Veterinary Assistant

Allie attended Kent State University Tuscarawas and has been practicing for three years. She prides herself in creating a fun and welcoming space so both patients and clients feel comfortable.

In her free time, she enjoys camping, traveling, hiking, longboarding, visiting national parks, and spending time with her golden puppy and eight-year-old daughter.

Kennel Staff

Linsey - Kennel Technician
Linsey - Kennel Technician

Linsey has been a vet assistant for three years and attended Columbine High School. She takes pride in her work by making sure every patient gets what they need. She likes to read, draw, play World of Warcraft, do outdoor stuff, and spend time with her family.

Megan - Kennel Technician
Megan - Kennel Technician

Megan is a kennel assistant here at Cherrelyn Animal Hospital. She has been practicing for three years and attended Overland High School. She takes pride in taking care of the patients and continues her education in the veterinary field.

She likes to play video games, hang out with friends and family, and play with her cat.