Our caring and compassionate veterinary care team!

Meet the Veterinarians & Team of Kimball Animal Hospital in Clawson! We’re pleased to provide exceptional vet care for your pets! Please call us at 248-288-1100 to speak to one of our caring veterinary staff members!

Jason Rivas (He/Him), DVM

Veterinarian & Owner

Dr. Jason Rivas graduated from the Michigan State University College of Veterinary Medicine in 2003. A few years after graduation, he started his own business as a relief veterinarian. He performed relief at Kimball Animal Hospital first in 2008, became a full-time associate in 2013, purchased the practice in 2014, and doubled the hospital size with an expansion in 2018.

He enjoys practicing general veterinary medicine and surgery; and creating fun, educational videos. In his spare time, he enjoys reading books, watching movies, family tree research, and the occasional video game. Dr. Rivas lives in Ferndale with his wife, Cassandra; their son Theodore; dog- Frankie-Loo; and cats- Charlie, Hugo, Poppins, and Strax.

Laura Witherell, DVM


Bio coming soon!

Abby Zasadny (She/Her) LVT, BHSA

Practice Manager

Abby has been a Licensed Veterinary Technician for over 14 years and completed her bachelor’s degree in Health Service Administration from Baker College in 2013. Abby was part of the Kimball Animal Hospital team years back as a technician, and has now re-joined the team as their Practice Manager. She has experience in preventive and emergency veterinary care, teaching, medical diagnostic equipment support, and management.

Abby lives at home with her husband Matt and their son Oliver. They are blessed with a house full of critters including their 15 year old Chihuahua “Stoli”, 9 year old Chihuahua/Fox Terrier “Jalapeno”, 4 year old Chihuahua/Papillion “Sake”, 1 year old Pitbull/Shih Tzu “Nelson”, 16 year old cat “Jager” and Leopard Geckos “Jack & Coke”. In her free time, Abby enjoys spending time with friends and family. Abby’s future goal is to continue to make Kimball Animal Hospital feel like home to staff, clients, and their fur kids.

Lisa (She/Her)

Office Administrator 

Lisa has been at Kimball Animal Hospital since December of 2018. She has over 10 years of experience working in the customer service field. She has 2 Associate Degrees in General Business and Business Management.

In her free time, she enjoys spending time with her fiancé Rick, their Siberian Husky Ghost, and their two cats Cookie and Luna Petunia. In her spare time, she enjoys going to concerts, movies, gaming, listening to one too many true crime podcasts, going up north, and she loves to go kayaking in the summer with her friends.

Kat (She/Her)

Licensed Veterinary Technician

Kat is a 2020 Baker College graduate in Veterinary Technology. Kat started as an assistant at Kimball in July of 2019. Kat currently has one rescue cat named Socks, and she is excited to help care for many more.

Tamra (She/Her)

Licensed Veterinary Technician

Tamra Jane is a 2011 graduate from Wayne County Community College’s veterinary technician program, and taught in the same program until it was sadly closed down. Tamra is happily married, with 3 two legged children, and 2 four legged fur kids. In her spare time, she enjoys camping and spending time with her family.

Tony (He/Him)

Veterinary Technician

Hailing from Michigan’s Upper Peninsula, Tony has been working in the veterinary field for 14 years. Outside of working with animals, his hobbies and interests include: Playing music, reading, attending concerts, and jogging.

Israel (He/Him)

Veterinary Technician

Bio coming soon!

Amanda (She/Her)

Veterinary Technician

Bio coming soon!

Denise (She/Her)

Licensed Veterinary Technician

Bio coming soon!

Ka’Vree (She/Her)

Licensed Veterinary Technician

Bio coming soon!

Mike (He/They)

Veterinary Assistant

Mike has been working in the animal field for 7 years and grew up with several animals in the house to always maintain a basic knowledge of care. While part of the Kimball team, he hopes to further his education and make current and future clients as happy and comfortable as possible.

Kim (She/Her)

Veterinary Assistant

Kim has been a part of the Kimball team since 2020 and is very happy to be back in the veterinary field. She enjoys cooking and spending time with her husband and her new kitten!

Kira (She/Her)

Veterinary Assistant

Kira has worked in the health care field for both humans and animals for 4 years. Kira knew from a young age that helping others was her calling. Outside of work, she enjoys the outdoors, travelling, and spending time with her 2 cats Marley & Lester.

Melanie (She/Her)

Client Care Representative

Melanie is a graduate of Oakland University with a Bachelors of Human Resources with a specialization in Human Services. Her home is very busy with a husband, 3 kids, her rescue dog Daisy, and her spicy chihuahua Danzig. In her very small amount of downtime, she likes to spend it volunteering for a dog rescue.