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Our Veterinarians

Meet the folks who make it all happen. We see big potential in every moment, and care deeply about what we do every day.

Dr. Annjolyn Pecoraro-Knoll
Fear Free Certified Professional

Dr. Annjolyn Pecoraro-Knoll

Owner, Veterinarian


Animals made a lasting impression in Dr. Annjolyn Pecoraro-Knoll’s life very early on—she can’t remember a time when she didn’t want to improve the lives of the earth’s creatures in whatever way she possibly could. Dr. Knoll has been a part of the veterinary profession since she was only 15 years old! She’s proud to now serve as the owner and operator of Knoll Animal Hospital.

A native of Lombard, Illinois, Dr. Knoll earned her Bachelor’s degree from Elmhurst College and studied veterinary medicine at St. George’s University in Grenada to obtain her Doctorate. She completed her clinical rotations at the University of Illinois at Urbana-Champaign. Dr. Knoll has special interests in dentistry, cardiology, dermatology, and exotic-pet care, and she remains an active member of the Illinois State Veterinary Medical Association and the American Veterinary Medical Association. She purchased Knoll Animal Hospital in March of 2015, and has been helping the pets and animal parents of the area ever since!

Away from the office, Dr. Knoll enjoys staying active in the community, traveling, and spending time with her family. She and her husband, Ryan, have twins named Parker and Gwen. They share their home with five furry companions: Howard the Shih Tzu mix; a Beagle mix named Ember; two Chihuahua mixes named Pinocchio and Geppetto; and one loveable cat named Bernadette.


Dr. Angela Clark
Fear Free Certified Professional

Dr. Angela Clark

Associate Veterinarian


Dr. Angela Clark grew up in Lisle, where animal care was a part of her earliest memories. For her, another career path simply wasn’t an option! Dr. Clark has been bettering the lives of pets across Illinois for more than 17 years, and is thrilled to continue her journey as a member of the Knoll Animal Hospital family.

Dr. Clark earned her Doctoral degree from the University of Illinois at Urbana-Champaign. She joined the Knoll Animal Hospital team as an Associate Veterinarian in August of 2017, and brings with her particular interests in the fields of dentistry, feline medicine, and internal medicine.

When she’s not tending to pets’ needs here at the clinic, Dr. Clark loves watching football, fishing, reading, and drawing. She resides in Westmont with her husband, Colin, their son, Owen, and a variety of pets ranging from dogs and cats to birds and guinea pigs.


Dr. Kate Maas
Fear Free Certified Professional

Dr. Kate Maas

Associate Veterinarian


Growing up an only child in the southwest suburbs of Chicago, Dr. Maas was never afraid to get dirty and spent most of her waking hours outdoors. From as far back as she can recall, there were always plenty of animals around – from dogs and cats to poultry and rodents. As she got older, her mother tried to expose her to other areas of interest, but the calling to work with animals was just too strong. It was only natural that she would end up pursuing a career as a veterinarian.

As soon as Dr. Maas was old enough to work, she landed a job as a kennel assistant at a nearby veterinary hospital. From there, she worked her way up through various roles and several clinics, from client service rep to assistant to technician. By the time she started veterinary school, she had already worked in just about every department. Following a stint at the Brookfield Zoo in Chicagoland, Dr. Maas was accepted to the University of Illinois, where she earned her DVM. Clinically, Dr. Maas has a particular fascination with anesthesia, dentistry and dermatology.

Outside of the clinic, Dr. Maas is fur-mom to a six pound Chihuahua mix named Nanna. After a long day at work, Nanna sits calmly, watching Dr. Maas cook in the hopes of catching a falling morsel of food. Nanna enjoys going for short walks but would rather snuggle up on the couch watching reality TV together. In her spare time, Dr. Maas enjoys fine cuisine cooking – especially ratatouille. She also enjoys rock-climbing and horseback riding. Recently, she acquired an espresso machine and is currently working on creating at home barista lattes!


Pet Visits

22,005

Pet Visits

Treats Given

19,115

Treats Given

Mouths Cleaned

19,166

Mouths Cleaned

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