205 East O'Connor Drive
Elkhorn, WI 53121
(262) 723-2644
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Small Animals Doctors & Staff
Dr. Jeffery Korosec graduated from the University of Wisconsin - Madison School of Veterinary Medicine in 1991. He joined the Elkhorn Veterinary Clinic in 1992 and became a partner in 1999. His special interests are soft tissue and orthopedic surgery. Dr. Korosec, his wife, three daughters, and one son live in the Elkhorn area with their two dogs and 4 cats. The Korosec family can often be seen together training for family triathlons.
Dr. Colleen Stewart grew up in Williams Bay and currently lives in the area with her husband, three sons, adopted barn cats, a Green Wing Macaw, Yellow Crested Cockatoo, Red Lored Amazon, chinchillas, and an adopted Thoroughbred race horse off the track. Dr. Stewart completed her undergraduate degree in Zoology at the University of California - Davis. Then, she graduated from the University of Wisconsin Madison School of Veterinary Medicine in 1994. She started working at the Elkhorn Veterinary Clinic in 1995. Her interests include small animal internal medicine, soft tissue surgery, and the animal/human bond.
Dr. Derek Williamson graduated from the University of Wisconsin - Madison School of Veterinary Medicine in 2003 and joined the clinic shortly after graduation. He is interested in small mammals (rabbits, ferrets, etc.), and soft tissue surgery. He is also developing his skills in orthopedic surgery and ultrasonography. Dr. Williamson, his wife, and 2 daughters have three rabbits and their Border Collie, Chuck.
Dr. Ellen Waller received her Doctor of Veterinary Medicine from the University of Illinois in 1980. She worked in a mixed animal practice and then joined the Peace Corps, where she worked with a cattle cooperative in Africa. Dr. Waller has been engaged in small animal practice in this area since 1993, and joined Elkhorn Veterinary Clinic in December 2007. She enjoys all aspects of general practice and has special interests in feline medicine and surgery, geriatric care, dentistry, and animal behavior. Dr. Waller lives with her husband, Gianni, on a small farm in Woodstock, Illinois which they share with Lucky, the lab, and an assortment of cats, horses, goats, geese, and chickens.
