Meet Our Team in Zion

Tonya Gray

DVM, Owner

Dr. Tonya Gray received her Doctorate of Veterinary Medicine from the University of Illinois Urbana-Champaign in 1998. Her areas of interest include dentistry, having completed extensive training from the University of Wisconsin Madison, and emergency surgery. She holds professional memberships with the Chicago Veterinary Medical Association (CVMA), the American Veterinary Medical Association (AVMA), and the Illinois State Veterinary Medical Association (ISVMA).

Dr. Gray chose her career path for the love of science and pets. She knew veterinary medicine was the right fit since high school and enjoys nurturing close, longtime bonds with families as they care for pets. Her most rewarding experience in her career is opening Zion’s first animal hospital and offering residents affordable veterinary care that’s also state-of-the-art.

Dr. Gray married her husband Rick the same year she started veterinary school. Raising their three sons, Ricky, Derrick, and Benjamin, is her greatest life accomplishment. When she’s not busy helping pets and their families, she’s cooking for hers, watching her sons play sports, weight training, or running – she recently ran her first half-marathon.

Linda Lewiston

Associate Veterinarian

Dr. Lewiston earned her DVM from Iowa State University in 2009. She then completed a small animal rotating internship at Animal Emergency and Referral Center in Northbrook, IL. She is a graduate of the Karen Pryor Training Academy and is a certified training partner. Prior to becoming a veterinarian, she worked as a high school science teacher, a junior high/high school guidance counselor, and an emergency medical technician for a hospital-based ambulance service. She got into veterinary medicine because she had a cat that started having seizures. The veterinarian that took care of her encouraged Dr. Lewiston to become a veterinarian, and so she did! In her current role, she enjoys working with animals and giving them the best quality of life possible. She believes that in order to work with animals, you must work with the owners, and that can be extremely rewarding!

At home, Dr. Lewiston has two Boxers and four Golden Retrievers. She and a friend breed Golden Retrievers and many of the puppies have become service dogs. One is even a drug sniffing dog with a police department! She enjoys doing conformation, obedience, and agility with her dogs and has earned obedience titles and good citizen titles for many of them! She also works with many rescues to help dogs who have behavioral issues become better suited for adoption. In addition to her dogs, she has multiple cats that are all rescues who needed a place to call home! In her spare time, she enjoys curling up with a good book and cat on her lap.

Cindy Tippet


Cindy is excited to be at Gray Animal Hospital and she looks forward to working with our team and our patients. What she finds most rewarding about her position is being able to work with so many great people and helping in any way she can—she’s a people person, and she loves helping others. Cindy married her high school sweetheart, Jeff, and they now have three grown children and three grandchildren. She’s extremely proud of them, and could not ask for a better reward in life. Cindy and her husband also have two pets; a Yellow Lab named Phoebe and a male Butterfly Betta named Fin. She loves spending time with her family, along with doing needlework, babysitting her grandkids and watching the Chicago Blackhawks.


Angelica Marmol

Veterinary Technician

Angelica began as an assistant at an exotic animal hospital and absolutely loved it. So, she continued her education and received her associate’s degree in science for veterinary technician and her CVT license. She loves being able to help animals in her job and some of her greatest achievements involve animals, too, including completing a volunteer program in Costa Rica that dealt with saving Howler Monkeys.

Outside of work, she enjoys movies, particularly Eat, Pray, Love and the Secret Life of Walter Mitty. She also enjoys sushi and pizza, but maybe not together! She shares her home with an American Eskimo, Lobo, a Silky Terrier, Brownie, as well as an African Gray Parrot, Echo.

Ashley McFarland

Veterinary Technician

Ashley has wanted to be a veterinarian since she was a kid. Working with animals brings her joy and helping them feel better is so rewarding. Ashley holds a BS degree in Zoology from Southern Illinois University in Carbondale, IL. In her current role, she loves forming a bond with owners and their pets, as well as contributing to client education.

Brenda Munoz

Veterinary Technician

Brenda has always wanted to work in the animal care industry since she was young. She is certified as a veterinary assistant and is currently enrolled in a course to become a certified veterinary technician. Her favorite part about her job is having the opportunity to help animals that are sick.

Brenda and her husband have three pets including Lobo, a German Shepherd, Tinkerbell, a Maltepoo, and Miso, a Holland Lop bunny. In her spare time, she enjoys painting (using acrylic, watercolor, and oils), going to concerts, and watching action movies.

Monica Cordero

Veterinary Assistant

Monica decided on a career in veterinary medicine due to the passion she has for animals. She believes that her greatest life accomplishment so far has been to professionally work for the care of animals.

At home, Monica lives with her family, Alex, Alex Jr., and Kassandra, as well as their pets, Diesel, a German Shepherd, and Guillermo, a green checkered bird. When she has time, Monica enjoys reading, spending time with her family, and exercising.

Morgan Schenk


Morgan loves animals and is happy to have the opportunity to work with them! She enjoys hearing people’s stories and knowing that she and the team are helping their animals.

She and her boyfriend, Primo, met at work and have been together since. They have a Siamese cat named Kitty and a blue Beta fish named Cash. Morgan enjoys being outside, whether it’s riding motorcycles, bicycling, going for a walk, or just sitting outside. One thing she absolutely loves is tacos!

Angie Domena

Veterinary Assistant

Every since she was a little girl, Angie has dreamed of having a job where she could help animals. As someone who was always fascinated with the medical aspect of animal care, it seemed fitting for her to seek a career in the veterinary industry! She received her certificate as a veterinary assistant from the College of Lake County to further her career in veterinary medicine. Now, she gets to work with animals every day, and finds that the most rewarding part of her job is helping animals day-in and day-out.

At home, she and her spouse have a son, Nicco, as well as a Chihuahua, Sugar, and a freshwater tank filled with 3 fish and shrimp. In her spare time, Angelica enjoys drawing, going to forest preserves with her dog and son, and cooking—particularly her favorite dish, fettucine alfredo!

Heather Salica

Veterinary Technician

Heather earned her bachelor’s degree in sociology from UW Parkside. Since she was a child, she has always loved animals and caring for them. She especially loves the bond between humans and animals, and how much joy they can bring to our lives! The most rewarding part of her career is being able to provide compassionate care to the animals she sees.

Heather is married to her husband, Dustin, the best dog-dad ever! They have an energetic Boxer named Mia who they just love and adore! In her spare time, Heather enjoys pottery, baking, working out, and spending time with family. Oh, and eating chocolate! She and Dustin also love movies and her favorites are comedies, and the movie, Jaws. She also loves to watch Shark Week!

Maria Ramirez

Veterinary Technician

Maria received her DVM from the Universidad Autónoma de Zacatecas in 1987. She chose to become a veterinarian because of her father. She grew up on a ranch and helped her father care for the animals, and that’s how her love for them grew! In her current role, she loves helping with surgeries and seeing pets improve while in her care.

Maria and her husband, Francisco, have two children, Grecia who is studying for her master’s degree, and Francisco who is finishing his undergraduate degree. They have a dog, Milo, an Australian Shepherd, Pancholin, a cockatiel, and many fish! In her spare time, she enjoys listening to music and reading. One of her greatest accomplishments in life has been coming to a new country and having her children understand and be a part of two cultures.