About Mad River Veterinary Hospital and Staff
Your pets are your family. They are video stars, lap-warmers, fallen-food patrollers, and bed-hoggers. They love, comfort, entertain, and support you. So when they need healthcare, you want to turn to someone you trust. Your pets’ health is our calling, and we are here to help you every step of your companionship together.
They keep you happy; we keep them healthy!
Meet Our Team
Our caring, professional staff is helpful, friendly, and dedicated to providing the highest quality of care possible for your animals.
William J. Maynard, DVM
Dr. William Maynard (Dr. Joe) graduated from The Ohio State University College of Veterinary Medicine in 2006. He received his B.S. in Biology from Wright State University. A longtime Springfield native, he graduated from Northwestern High School. He served as a combat medical specialist in the U.S. Army before continuing as an EMT in the civilian world. While taking classes at Wright State, he became more interested in the veterinary side of medicine and has been hooked ever since. He graduated from The Ohio State University College of Veterinary Medicine in 2006. He and his wife Nikki founded Mad River Veterinary Hospital in 2013. Dr. Joe particularly enjoys surgery. Outside of work, he spends time with his sons Ryan, Evan, and Luke, and playing frisbee with his pit bull Vanessa.
Nikki L. Maynard, DVM
Dr. Nikki Maynard (Dr. Nikki) originally hailed from the Urbana area and graduated from Graham High School. She received her B.A. in Biology from Wittenberg University. After receiving her doctorate from The Ohio State University College of Veterinary Medicine in 2010, she spent three years as a mixed animal practitioner before starting a new adventure as a small animal practice owner. An avid horsewoman, she showed her Arabian horse in hunt seat and dressage for years. She lives for travel, hiking, theater and music, and torturing Joe with cooking experimentation. Most of her free time outside of work is devoted to caring for two young sons.
Megan Leese, DVM
Dr. Megan Leese grew up in Indiana, and knew she wanted to be a veterinarian since she was three years old. She never wavered from her dream and made it a reality when she graduated from Purdue University College of Veterinary Medicine in 2018. Since January 2019, she has enjoyed working at Mad River Veterinary Hospital. In her free time, Dr. Leese enjoys being outside when the weather is nice, and spending time with friends and family.
Jessica Rossel, DVM
Dr. Jessica Rossel grew up in St. Marys. She received her B.S. in biology from Wittenberg University. In 2015, she graduated from The Ohio State University School of Veterinary Medicine. Before joining Mad River Veterinary Hospital in January 2022, she worked as a small animal general practitioner. In her free time, she enjoys reading and spending time with her family.
Abigail Niswonger, DVM
Dr. Abigail Niswonger is originally from the Troy, OH area and is a graduate of Miami East High School. She graduated from Otterbein University with a B.S. in Zoo and Conservation Science. She earned her doctorate from The Ohio State University College of Veterinary Medicine in 2022. Dr. Niswonger practices general surgery, dental cleanings and extractions, and preventative care at Mad River Vet Hospital. In her free time she enjoys gardening, music, and spending time with family and friends.
Our Veterinary Technicians
We are fortunate to have an amazing staff of technicians to assist in treating your pets.
At Mad River Vet Hospital, veterinary technicians handle many of the same responsibilities that nurses and other professionals perform for physicians – and, like veterinarians, they are trained to work with several species of animals. Vet Techs are trained to: obtain and record patient case histories; collect specimens and perform laboratory procedures; provide specialized nursing care; prepare animals, instruments, and equipment for surgery; assist in diagnostic, medical, and surgical procedures; expose and develop radiographs (X-rays); advise and educate animal owners; supervise and train practice personnel; and perform dental prophylaxes. All veterinary technicians work under the supervision of our licensed veterinarians.
Left to right: Katie, Crystal, Morgan, Sarah, Shelby, Emma, Angel, and Lori.
We have an amazing team of dedicated and passionate reception staff. Their goal is to make your overall experience as pleasant and productive as possible. Our reception staff provide a front of house service to all veterinary clients visiting or calling into our practice. We strive to greet and assist each owner as they arrive and help them to feel relaxed, comfortable and welcome. Our staff is ready to assist you with appointment scheduling, vaccine records, payment for services, and other customer service related items.
from left to right: Sara, Missy (office manager), Heather, Paula, Lori, Laura