Mark Hamilton, CVPM - Regional Hospital Administrator, Hospital Owner

Mark spent most of his free time as a child chasing reptiles around northern Arizona and southern California. He joined the U.S. Army after high school which gave him the opportunity to chase reptiles around the southeastern United States, Europe, and the Middle East. Mark has cared for and raised many species of reptiles over the years. Although reptiles are his primary interest, he has a strong passion for all exotic pets. He currently spends most of his free time fishing at Arizona’s desert lakes or photographing rattlesnakes.  


Natalie was born and raised on Vancouver Island, off the west coast of Canada. She found her way to Colorado in 2015 and has been working in the animal care field since 2017. She has a lifelong love of pets and has nearly never been without at least a couple of furry friends in her home. Currently, Natalie and her husband are owned by five cats and two dogs; she has also been privileged in the past to care for rabbits, guinea pigs, hamsters, and rats. In her spare time Natalie can frequently be found crocheting or "attempting" to teach her dogs new tricks.

Victoria, BS, AAS, RVT

Victoria originally grew up in the urban jungle that is south Florida. Before graduating from Florida State University with a bachelor’s degree in biology, she discovered her passion for working with animals at the Tallahassee Museum, the Florida Fish and Wildlife Conservation Commission, and the Goose Creek Wildlife Center. She then moved to Colorado for a change of scenery shortly after receiving her degree.

Dr. Bill Guerrera, DVM, Hospital Owner

Dr. Guerrera is a graduate of Colorado State University with a strong interest in avian and exotic pets. He has worked at the Denver Zoo and was involved in several field studies, including mountain gorillas in Uganda and sea turtles in Costa Rica. He has presented at multiple national conferences on a variety of topics in exotic animal medicine. One of his main areas of expertise is managing advanced dental disease in rabbits.

Madeleine "Maddi"

Maddi was born and raised in Denver, Colorado spending a majority of her childhood collecting and learning about creatures of all kinds. She moved to Arizona in pursuit of her passion for animals, working towards obtaining her degree in conservation biology at Arizona State University. During her time in Arizona, she has provided veterinary care for injured and sick birds of prey through the Wild at Heart raptor rescue and began her journey at Arizona Exotic Animal Hospital in Mesa.


Paige grew up on the east coast, moving to Colorado in 2008, she fell in love with the mountain views and colorful culture. As an introvert you will often find her painting or free-writing at home. Speaking of home, she keeps a very full house! Her family includes her cat Elayne, dog Pluto, bearded dragon Mickie, leopard gecko Misty, two Guinea pigs Ruby and Lillith, Pac-Man frog Goblin, and rabbit Ms.May; completing the pack with her loving husband Zack. A “go with the flow” personality allows Paige to face challenges head on walking through life with an open-mind and loving heart.

Chelsea, BS, AAS

Chelsea was born and raised in South Carolina. She has a Bachelor’s in Wildlife Biology and Rehabilitation from Lees McRae College in North Carolina and an Associate’s in Veterinary Technology from Bel-Rea in Denver, Colorado. She has always had a passion for working with exotic animals and wildlife especially birds of prey, so she is very excited to expand her learning in avian medicine and surgery. Currently, she lives in Denver with her three cats and a red tail boa. On her days off you can find her hiking or enjoying local music venues.


Ray has nearly a decade of experience in the animal industry. They have worked in shelters and vet clinics throughout their home state of Mississippi, as well as a five year stint managing a pet supply store. They have been obsessed with animals from a very young age.

Deshina "Des"

Des was born and raised in Colorado. She graduated from Community College of Denver with a certificate in veterinary technician assisting. She has always wanted to work with animals ever since she was young and growing up mainly around dogs and cats has steamed her interest into caring for the exotic critters and growing more knowledge about them. She may seem reserved, but her background as an assistant working with dogs and cats is truly shown around the Colorado Exotic Animal Hospital.


Mary was born and raised in upstate New York before moving to Colorado in 2021. She grew up around dogs and cats, but her interest in exotic animal medicine began after adopting a hedgehog during her early twenties. Since then, she has gone on to earn her Associate’s in Applied Science in Veterinary Technology at LaGuardia Community College in Long Island City, NY. After working with dogs and cats for a few years after graduation, Mary was excited to accept a position at Colorado Exotic Animal Hospital to pursue her interest in avian and exotic animals.