About Us

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

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

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

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

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

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. In her free time she enjoys gardening, music, and spending time with family and friends.

Our Veterinary Technicians

Our Veterinary Technicians

We are fortunate to have an amazing staff of technicians to assist in treating your pets. Left to right: Katie, Crystal, Morgan, Sarah, Shelby, Emma, Angel, and Lori.

Our Receptionists

Our Receptionists

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.

from left to right:  Sara, Missy (office manager), Heather, Paula, Lori, Laura

Make an appointment
with us today!

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