Most recently, she was a clinical veterinarian at Seattle Biomedical Research Institute in Seattle, Wash. (2002-03). She previously was on staff as a clinical veterinarian at Virginia Mason Research Center in Seattle; Mount Vernon Large Animal Veterinary Service in Mount Vernon, Wash.; and Clover Valley Veterinary Hospital in Langley, British Columbia, Canada (1997-2002).
Johnston completed a postdoctoral research training fellowship at the University of Washington School of Medicine in Seattle, Wash. (2003) and an internship in large animal medicine and surgery at Washington State University College of Veterinary Medicine in Pullman, Wash. (1997). She earned her veterinary medicine degree at the University of Illinois in Urbana, Ill. (1996) and her bachelor's degree at Carleton College in Northfield, Minn. (1992).
She has received veterinary accreditation from the U.S. Department of Agriculture and is a member of the American Veterinary Medical Association and the American Association of Laboratory Animal Science. She is the author of several journal articles.
A native of Bourbannais, Ill., Johnston is married and has two daughters. She is the daughter of Dr. Kenneth and Marlou Johnston.