Meet the team

Meet the Veterinarians & Team of Lock One Animal Hospital! We’re pleased to provide exceptional vet care for your pets!

Get to know our team!

We are solely dedicated to your pet’s care! We look forward to getting to know you, and we hope you’ll take the time to scroll down and get to know us.


Veterinarian / Owner

Dr. Geoff purchased the practice from the founder and long-time owner of Lock One Animal Hospital, Dr. Sam Thompson, in 2021. He was born and raised in the GTA but moved to the beautiful Niagara Region upon graduation from the Ontario Veterinary College. Dr. Geoff’s favourite aspect of veterinary medicine is getting to meet new pets and people and celebrating the happiest moments, as well as helping through the toughest moments in our pets’ lives.

Outside of work, Dr. Geoff enjoys spending as much time as possible exploring the outdoors with his partner and son, as well as his best friend, Bindi, the golden retriever. He is also tolerated by two cats, Garfield and Lettuce.

Dr. Rianne Kamula

Dr. Rianne Kamula


Dr. Rianne is a 2017 graduate of the Ontario Veterinary College and has been practicing veterinary medicine in Toronto for the past four years. After recently moving to St. Catharines from Toronto, she is very excited to join the Lock One Animal Hospital team.

In the past, she has been involved in community outreach in many different cities around Ontario. Dr. Rianne is passionate about all aspects of small animal medicine but takes a particular interest in oncology and internal medicine.

Dr. Rianne has a cat named Franklin, who considers himself to be a dog. He loves all people, plays fetch, and can even sit on command. When she is not trying new recipes at home in the kitchen, she enjoys participating in many different sports year-round. You can most definitely find her on a golf course when the weather is nice, in the gym, or out for a hike with friends. She has recently been enjoying her weekends exploring the many wineries the Niagara region is famous for.

Dr. Rianne Kamula

Dr. Amanda Salazar


Dr. Amanda was born and raised in Mississauga. After graduating from the Ontario Veterinary College in 2016, she moved to the Niagara Region, where she practiced at another local clinic for six years before joining the Lock One team in 2022.

Dr. Amanda believes in a preventive approach to medicine and enjoys working with pet owners to ensure that all her patients remain healthy and happy. She has a special interest in internal medicine and surgery.

When not working, Dr. Amanda enjoys spending time relaxing with her family. Ever since she was very young, her family has included German Shepherds, including her current special girl, Lexi. Additionally, her pet family now includes two cats, Eleanor and Carl. Dr. Amanda and her husband enjoy travelling, hiking, and cycling. She is also an avid reader.

Marie Heidebrecht

Registered Veterinary Technician

Marie has a passion for veterinary medicine and is always seeking to learn new things. She always advocates for her patient’s comfort and pain control. Marie looks forward to developing relationships with Lock One’s clients over the next number of years.

Marie’s curly-tailed brats, her Basenjis Indy, and Nike keep her busy whenever she’s not at work. Indy is a senior now with lots of needs, and the youngster Nike has boundless energy and particularly enjoys chasing squirrels and the sighthound sport of lure coursing. Marie’s other hobby is photography, although the two are closely linked since her favourite subjects are her dogs!

Sarah Haeni

Registered Veterinary Technician

Sarah has always had a passion for animals, leading to her career in veterinary medicine. She graduated from the veterinary technician program at Sheridan College in 2012 and continuously strives to expand her knowledge. She prides herself on treating each animal with love and respect while providing them with the high-quality care that they need.

In her free time, Sarah enjoys spending time with her two daughters, her husband, and their golden retriever, Bentley. Their favourite place to be is either at the cottage or the gym. Sarah is currently on maternity leave after the birth of her second daughter, but we are all looking forward to her return later in 2023.

Amy Whatley

Registered Veterinary Technician

Like most technicians, Amy’s love for animals started when she was very young. Her family has had basset hounds since she was 5 years old and she is a self proclaimed basset hound enthusiast!

Amy studied psychology at the University of Windsor and graduated in 2014. After a course in animal behaviour, she volunteered at a veterinary hospital and knew she wanted to become a veterinary technician. Amy then graduated from St. Lawrence College in Kingston with an advanced diploma in Veterinary Technology in 2018. She became an RVT in 2019, and has a special interest in surgical nursing, dentistry, and client education.

Amy was born and raised in London, Ontario, but has made St. Catharines her home since 2019. In her free time, she loves spending time with her partner and her basset hound Heidi – they love going to the beach and exploring the Niagara area. Amy also shares her house with her cat Tika.

Christiana Kerckaert

Registered Veterinary Technician

Christiana has loved animals for as long as they can remember. They have a passion for practicing Fear Free medicine and strive to make every visit to the clinic a positive one. They moved from the small town of Tillsonburg to St. Catharines in 2016 to begin a career in veterinary medicine. They worked as a Veterinary Assistant for six years while attending school to become a Veterinary Technician. They graduated in 2022 and soon after obtained their RVT license.

In their spare time, Christiana has their hands full with all of their furry critters at home. Including five cats, a bunny, four guinea pigs, three rats, and the newest addition, Summer, the beagle! When they aren’t taking care of their zoo, they enjoy hiking, boxing, playing the piano, and exploring the many wineries and breweries the Niagara region has to offer!

Michelle Grosskurth

Lead Customer Service Specialist

Michelle’s goal is to make hospital visits stress-free for both the client and the patient. She has taken the fear-free certification program and wants to make any time spent at the hospital pleasant and worry-free. Michelle takes pride in being part of a team that provides the best medical care to clients and their furry families.

During her free time, Michelle enjoys hiking with her husband and three dogs, Bosco (border collie), Maggie (boxer), and Wasabi (chihuahua), visiting local breweries with friends, planting, and harvesting fresh fruit and vegetables, and spending time in nature.

Hannah Fischer

Animal Care Attendant

Hannah loves animals and feels great empathy towards them. She wants them to have as positive of an experience as possible when they come to Lock One. She feels lucky to be the one caring for them and does her best to read what they need, whether it be encouragement, calm energy, petting, space, etc. Hannah is very interested in dog training and animal behaviour, so she tries to learn from them and be as in tune with them as she can. She wants the animals to feel loved and safe under her care.

Hannah is passionate about dog training and is currently doing a dog trainer apprenticeship. She also enjoys trick training with her dog. In her free time, Hannah likes to hike, play ball hockey, go to the movies, cook, play board games, and travel. Every year she makes time to go up to the cottage as well.

Sarah Zarzycki

Animal Care Attendant

Sarah prides herself on her integrity, compassion, and empathy both for the patient and the owner. She is an avid animal lover and advocate, as well as a loving cat mom. Sarah treats every animal that comes through the door with the same love and compassion she shows her own.

In her free time, Sarah likes to do yoga, hiking, kayaking, photography, and spending time with her two cats, Mimi and Peep Peeps.