About Us

Dr. Janine Callen earned her Doctor of Veterinary Medicine degree from Purdue University School of Veterinary Medicine in 1994. Dr. Callen founded her veterinary practice Twinbrook Animal Clinic and opened their doors to the public in 1997. She didn’t always know that she wanted to become a Veterinarian but her family and friends assumed that she would be one. Being an animal advocate and getting to form relationships with patients and clients is what she appreciates and values most about her profession.

Dr. Callen enjoys spending time with her Quarter horses, Nic and Harley, when she is not busy attending to patients at the clinic. Sally and Jack, her two dogs, keep her on her toes all day. Jack, a Toy Manchester Terrier, rules the home, while Sally is the smartest Pit Bull/Cattle mix she has ever met.

Dr. Laurie Schessler obtained her Doctor of Veterinary Medicine degree from Purdue University College of Veterinary Medicine in 1995. In 2003, she became part of Twinbrook Animal Clinic and loves how compassionate their team is about what they do. Dr. Schessler’s primary motivation is to make a difference in the health and well-being of pets. 

Dr. Schessler enjoys outdoor activities but nothing beats quality time with family! She also appreciates some downtime spent reading. Her house is not a home without her Cocker Spaniel named Oreo, her cat named Foo Foo the Snoo, and her bunny named Oswald a.k.a Ozzy.

Dr. Shawna Rau graduated with a Bachelor of Science degree from Cornell University in 1994 and received her Doctor of Veterinary Medicine degree from Ohio State University in 1998. She joined Twinbrook Animal Clinic in June of 2008 and loves being part of a respectful, dedicated, and compassionate team. Dr. Rau grew up in a home with animals and has always known that Veterinary Medicine would be her career. It’s important for Dr. Rau to present Science-based information and educate pet owners to make informed decisions regarding quality preventative care and treatment. 

Dr. Rau enjoys staying busy with her family’s activities and sports events as a participant and a spectator. In her free time, she can also be found outdoors either running, scuba diving, traveling, eating interesting food, and taking advantage of the arts and entertainment of Pittsburgh. She enjoys narrating stories in the exam room about her dogs, cats, reptiles, and fish, as well as how her experiences caring for them have helped her connect with her patients and their owners.

Dr. Leeann Oliver is a graduate of Tufts University School of Veterinary Medicine and earned her degree in 1996. In 1999, she started working at Twinbrook Animal Clinic. While she enjoys all aspects of the practice, Dr. Oliver has come to especially appreciate working with geriatric patients and those with chronic conditions. Advances in early wellness screening, pain management, and compassionate palliative care have made it possible to add time and comfort to senior patients’ lives.

Dr. Oliver is a big fan of music and enjoys traveling. She also spends as much time as possible in Canada with her family. Other family members include a Beagle mix named Woodrow and a tripod cat called Horace.

Dr. John Tuttle earned a Bachelor of Science from the University of Pittsburgh in 2008 and a Doctor of Veterinary Medicine from the University of Pennsylvania School of Veterinary Medicine in 2012. Since his arrival at Twinbrook Animal Clinic in 2022, Dr. Tuttle has been grateful for the opportunity to work with a group of compassionate and skilled individuals who are dedicated to providing top-notch veterinary care to the community. Dr. John Tuttle is driven by the positive impact he makes on the lives of patients and their families.

Dr. Tuttle enjoys playing and watching soccer in his spare time, and he frequently volunteers as a youth sports coach. He also enjoys playing guitar and spending time being active with his family. His family wouldn’t be complete without Chase, their Golden Retriever.

Carly graduated from the Vet Tech Institute in 2012 and began working at Twinbrook Animal Clinic in the same year. What she likes best about the clinic is that it has everything she is looking for in a job, including coworkers. She has also always wanted to accomplish something fulfilling and enjoyable on a daily basis. On top of that, Carly wants to help dogs and cats, as they bring her joy.

Carly enjoys bowling, crafting, and gardening when she’s not at work. She shares her forever home with Doaree a cattle dog mix, Sabot a mixed-breed canine and two Domestic Short-haired cats named Tyger and August. Additionally, she has a red-tailed boa called Babayaga and a red-eared slider named Pops.

Laura received her education at La Roche University, Robert Morris University, and the Canine Rehabilitation Institute. She became part of Twinbrook Animal Clinic in 2002. The desire to help pets is what has driven her to pursue a career in Veterinary medicine and the most fulfilling work for her is interacting with people and assisting them in deepening their ties with their dogs.

Laura likes to spend time with her daughters raising and training their Vizslas and Beagles when she’s not working. Their precious dogs are frequently brought to a variety of activities, such as companion events, field trials, AKC hunt tests, and confirmation competitions. During her downtime, she appreciates any activity that fosters creativity. Laura and her daughters share their home with several dogs, which include six Vizslas, seven Beagles, and a single English pointer named Puck. On top of that, they also own a few game birds.

Liz is set to graduate in 2023 with an Associates Degree in Veterinary Technology. She has a Veterinary Assistant certificate and currently attending San Juan College in New Mexico to become a Veterinary Technician. She started working at Twinbrook Animal Clinic in 2019 to pursue a career she’s passionate about. She has a strong desire to work with animals since she grew up around them. What Liz likes most about her chosen field is that it never gets old because each day presents a new challenge.

She spends her free time hiking with her dogs and enjoys a hiking challenge where they go on one hike per week for at least a mile. She also sets aside time for kayaking, watching movies, drawing, doing sports, and eating. Liz looks after two dogs, three cats, a hamster, seventeen chickens, five ducks, four fish tanks, and seven hives of honey bees. Her mixed-breed dogs are Willow, and Jade. Stanley, Grayson, and Ripley are her DSH kitties and her lone hamster is named Alfie.

Nicky became part of Twinbrook Animal Clinic in 2015. She is our Lead Client Service Representative. Nicky has grown up in the veterinary industry and is always happy to help in all areas of the hospital.

In her spare time, she enjoys boating and outdoor activities with her family, friends, and dogs. A fun fact about Nicky is she’s a firefighter/first responder in her local community and has a therapy dog named Petunia, a chocolate lab, who is trained as a debriefing dog for the Fire Department.

Christina joined the Twinbrook family in 2023. She has always loved animals. One of her first jobs was at a kennel. As time passed, she got a part-time job in the front office of a veterinary clinic. She is thrilled to become a full-time employee of Twinbrook Animal Clinic. She loves to be a part of a team that helps provide needed services to the clients and patients of this practice. In her spare time, Christina enjoys spending time with her family and friends. Fishing and ATV riding are among her favorite outdoor activities. She shares her home with her rescued 2-year-old Great Dane named Lincoln.

Lin completed a one-on-one apprenticeship which included 240 hours of hands-on grooming. Lin joined Twinbrook Animal Clinic in 2020, bringing with her 26 years of animal expertise. She values everything about her chosen profession and enjoys every minute of her time at the clinic.

Boating, camping, fishing, and swimming are among her favorite outdoor hobbies. She also enjoys snowmobiling and has traveled to Canada on snowmobile expeditions. Lin has opened her doors to an array of animals, including three dogs, three ducks, six cats, eight chickens, and nine fish.

Sarah graduated in 2010 from Thiel College with a bachelor’s degree in Biology minors in medical biology, wildlife biology and coaching. She began working at Twinbrook Animal Clinic in August of 2012. Sarah considers her coworkers as family and loves that they work very well as a team to get everything done. Sarah has always wanted to work in the veterinary field since she was a kid and now aims to educate new puppy owners and prefers working behind the scenes with diagnosis and treatments. 

When she’s not at work, Sarah enjoys hiking, 5k running and half marathons. Photography is also a hobby she makes time for. She has given Luna a black lab, Crosby a rex rabbit and Tortuga the turtle their forever home.

Abbi attended Butler County Community College and took up General Studies. In 2022, she joined Twinbrook Animal Clinic. 

When she’s not at work, Abby loves traveling, going to penguin games, and spending quality time with her dogs. She has opened her doors to Maggie the 5-year old Airedale and Max the 8-year old Cocker Spaniel Mix.

Biography coming soon.

Coralie studied Equine Management at Williams Woods College and has trained horses from 1979 to 2002. In April of 2002, she became part of Twinbrook Animal Clinic. The opportunity to work with and care for animals is what she loves most about her job. She also very much appreciates the team and everything they do for patients and their families. 

Coralie still trains horses part-time, works with dogs and pet sits when she can. When she’s not working, she enjoys gardening, painting, and reading. She has a total of eight cats and a Sheltie named Liam. Her six DSH cats are Pounce, Ben, Lily, Modeira, Jacob and Sasha. Possum and Spohia are her Domestic Longhair pair.