Meet Our Doctors

Dr. Tom Schwartz

Owner & Veterinarian

As an unwavering advocate for animals and their profound impact on our lives, Dr. Tom Schwartz is a highly respected and caring veterinarian with deep roots in the St. Louis community. Born and raised in this vibrant city, he attended John Burroughs High School before embarking on an academic journey that would solidify his passion for veterinary medicine.

Dr. Schwartz’s pursuit of knowledge led him to the University of Michigan, where he earned his undergraduate degree, and then to Michigan State University, where he attended veterinary school. After graduating with a Doctor of Veterinary Medicine, he returned to his beloved hometown and has been serving the St. Louis area since 1994. His dedication to the welfare of pets and his commitment to their well-being have earned him the trust and admiration of countless families throughout the region.

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With a wealth of experience under his belt, including a significant tenure as the Director of the Veterinary Health Center at Kansas State University, Dr. Schwartz brings a comprehensive understanding of animal care to his practice. Each patient that walks through his doors receives individualized attention and genuine affection, reflecting his deep-rooted belief that every animal deserves the best possible care.

Among his areas of expertise, Dr. Schwartz has developed a strong interest in orthopedic surgery, skillfully addressing musculoskeletal issues and providing pets with a chance at a better quality of life. Additionally, he is proficient in ultrasonography, a valuable diagnostic tool that aids in identifying and treating various medical conditions.

Outside of his professional pursuits, Dr. Schwartz finds joy in spending quality time with his family. His wife, Kelly, a long-time resident of the South Hampton neighborhood and a Bishop Dubourg alumna, shares his love for animals and the community. Their home is filled with the delightful presence of Gabbie, a charming and vocal rescue pup, Gracie, a loving golden retriever, and Zoey, the spirited and three-footed feline who manages to rule the roost.

As the owner of the practice, Dr. Tom Schwartz remains steadfast in his commitment to providing top-notch care, embracing a warm and welcoming atmosphere for both pets and their families. His genuine love for animals and decades of experience make him a trusted partner in ensuring the health and happiness of the cherished pets of St. Louis and beyond. Dr. Schwartz is also the proud owner of Hampton Animal Hospital and Watson Road Veterinary Clinic.

Dr. Tom Dierker


With over two decades of experience in the field of veterinary medicine, Dr. Tom Dierker is a highly skilled and compassionate veterinarian who truly cares about the well-being of animals. After graduating from the prestigious University of Missouri College of Veterinary Medicine in 1995, Dr. Dierker embarked on a journey dedicated to providing exceptional medical care to pets.

After gaining valuable experience in local practice, Dr. Dierker found his true calling when he became a cherished member of the Harvester Animal Clinic family in March 2000. Since then, he has been an integral part of the clinic’s mission to promote the health and happiness of beloved animal companions.

Dr. Dierker’s passion for animals is evident in his commitment to delivering the highest level of medical care. He approaches each case with precision, empathy, and a genuine desire to help. Building strong connections with his clients, their furry companions, and their families is one of the most rewarding aspects of his work.

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While Dr. Dierker is a talented and well-rounded veterinarian, he has developed a special interest in several areas. His expertise in internal medicine allows him to diagnose and treat complex medical conditions, ensuring that his patients receive the best possible care. Additionally, his proficiency in dermatology enables him to address skin and allergy issues that can greatly impact a pet’s quality of life. Moreover, Dr. Dierker has a soft spot for pocket pets, recognizing the unique care needs of these smaller furry friends.

Outside of the clinic, Dr. Dierker cherishes spending quality time with his family. They often embark on adventures together, exploring new places and hiking in nature’s beauty. Dr. Dierker’s Sheltie, Showdown, is an integral part of the family and enjoys playful moments with his doting owner.

Dr. Tom Dierker’s dedication to veterinary medicine, genuine love for animals, and expertise in various specialties make him an invaluable asset to the Harvester Animal Clinic and the wider community of pet owners. Entrusting your pet’s care to Dr. Dierker means placing them in the hands of a skilled professional who treats each patient with the utmost care and compassion.

Dr. Alec Swierk


Dr. Swierk is a passionate and dedicated veterinarian, who brings his expertise and compassion to the team. Born and raised in the heart of St. Louis, he has always had a deep affection for animals and an unwavering curiosity for the wonders of science. His academic journey led him to earn degrees from the University of Missouri – St. Louis and the University of Missouri – Columbia.

One of the aspects of his profession that Dr. Swierk particularly enjoys is the opportunity to interact with clients. He values open communication and takes the time to listen to pet owners, ensuring that they are well informed about their pets’ health and involved in the decision-making process. For Dr. Swierk, providing exceptional care starts with treating animal patients and continues to building lasting relationships with their human companions.

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As a dedicated St. Louis Blues fan, Dr. Swierk spends his leisure time cheering on his favorite hockey team. He shares these exciting moments with his partner, Jenny, who is also an avid hockey enthusiast. But the real star of their lives is their 8-year-old pup, Grizzly. Dr. Swierk and Jenny take every opportunity to indulge in playful activities and adventurous walks with their furry companion, cherishing the joy and unconditional love that Grizzly brings to their lives.

Dr. Swierk’s dedication to veterinary medicine, coupled with his genuine love for animals and commitment to client satisfaction, makes him a valued member of the team. Whether it’s a routine check-up or a complex medical issue, Dr. Swierk is thrilled to be entrusted with the care of the furriest members of your family.

Dr. Kiersten Sandquist


The Harvester Animal Clinic family proudly welcomes the arrival of Dr. Kiersten Sandquist, a highly talented and compassionate veterinarian. Driven by her lifelong affinity for animals and a profound fascination with the merging of science and medicine, she found her true calling in veterinary medicine at an early age.

Since childhood, Dr. Sandquist has been drawn to the remarkable bond between humans and animals, recognizing the incredible impact that pets have on our lives. This realization, coupled with her deep-rooted love for the sciences, led her to embark on a journey to become a dedicated veterinarian.

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Dr. Sandquist’s academic journey culminated at the esteemed University of Missouri, where she earned both her undergraduate degree and Doctor of Veterinary Medicine in 2022.

Among the various aspects of her veterinary practice, Dr. Sandquist finds pure joy in performing wellness exams. These check-ups provide her with invaluable one-on-one time to connect with each pet and their families on a personal level. Her empathetic nature and genuine care for her patients allow her to ensure their well-being and foster lasting relationships with their devoted human companions.

Beyond her professional and family commitments, Dr. Sandquist and her husband also prioritize their social life, enjoying the company of friends and family. Being avid sports enthusiasts, they take pleasure in attending nearby sporting events, adding a touch of excitement to their vibrant lifestyle. In her leisure hours, Dr. Sandquist relishes quality time with her husband, Alex, and their two adored pets: Willow the Goldendoodle and McCoy the Boxer. Whether relaxing together on the couch or taking leisurely strolls, these cherished moments add immeasurable happiness to their lives.

With her caring demeanor, unwavering dedication, and exceptional skills, Dr. Kiersten Sandquist enriches the Harvester Animal Clinic with her presence. Her passion for animals, combined with her outstanding education, makes her an invaluable asset to the veterinary community. Clients can rest assured that their beloved pets are in the most capable and caring hands under Dr. Sandquist’s expert care.

Dr. Lauren Christiansen


Dr. Lauren Christiansen is a dedicated and skilled veterinarian who brings a wealth of experience and expertise to our practice. Having completed her undergraduate studies at Indiana University, Dr. Christiansen pursued her veterinary training at esteemed institutions such as St. George’s University.

With a deep-rooted love for animals and an unwavering commitment to their well-being, Dr. Christiansen has found her true passion in veterinary medicine. Dr. Christiansen’s interest in dentistry and surgery, combined with her genuine love for animals, makes her a valuable asset to our veterinary team. Her dedication to providing exceptional care and her desire to see her patients thrive is evident in every aspect of her work. Clients can trust that their beloved pets are in the most capable and caring hands under Dr. Christiansen’s expert guidance.

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Aside from her professional endeavors, Dr. Christiansen enjoys the comforts of home, where her heart is shared with a delightful array of furry companions. Among them are Haymish, Pancake, Nessie, Momo, and Evi, who together form her small zoo of cherished animals. Their presence brings endless joy and love to her life, fostering a warm and inviting atmosphere at home. When she is not caring for her patients or spending time with her furry family, Dr. Christiansen relishes the tranquility of her home, engaging in hobbies that recharge her spirit and mind. Her love for animals extends beyond her veterinary practice, as she takes the time to provide her own pets with the best possible care and attention.

With her warm and compassionate approach, Dr. Lauren Christiansen looks forward to building lasting relationships with her clients and their furry companions. Her commitment to the well-being of animals and her exceptional skills in dentistry and surgery make her an outstanding veterinarian and a true asset to our practice.

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