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Brad Jackman, DVM, MS, ACVS

Dr. Brad Jackman Dr. Brad Jackman graduated from Kansas State University in 1987 with a Doctorate of Veterinary Medicine. After graduation, he completed a one year internship and 3 year equine surgical residency at the University of Georgia. After his residency, he served as an instructor of surgery at both the University of Saskatchewan and Washington State University and became board certified in surgery during that time. He joined Pioneer in 1995 and became a partner in the practice in 1996. In 2007, Dr. Jackman became the sole owner and CEO of Pioneer Equine Hospital. He continues to be an active committee member of the American Association of Equine Practitioners as well as the recruitment and development of equine veterinary students.

Dave MacDonald, DVM, MVSc, ACVS

Dr. Dave MacDonald Dr. MacDonald was born and raised in 'the great white north' (Canada). He obtained a Bachelor of Science degree from the University of Guelph and his Doctor of Veterinary Medicine from the Ontario Veterinary College university of Guelph. Following a one-year internship at Okotooks animal clinic in Alberta he completed a residency in large animal surgery and a masters of veterinary science at the Western College of Veterinary Medicine in Saskatoon, Saskatchewan. He became a diplomate of the American college of veterinary surgeons in 1997 and has been a staff surgeon at Pioneer Equine Hospital since December 2000. Dave's focus at Pioneer is surgery and lameness. Dave and his wife Erica have two sons, Jacob and Mitchell and enjoy spending time together outside


Karen Jackman (Unger), DVM

Dr. Karen L. Unger

A graduate of Colorado State University, College of Veterinary Medicine and Biomedical Sciences, Dr. Unger is our newest associate veterinarian. Dr. Unger, originally from Boksburg, South Africa, completed her Bachelor of Science in Animal sciences at Colorado State University and then went on to obtain her doctorate in veterinary medicine in May, 2003. Upon completion of her formal schooling, Karen completed a one year internship at Littleton Equine Medical Center in Colorado, and then stayed on as an associate until joining Pioneer. Karen’s professional interests include lameness, internal and preventive medicine, and ophthalmology. Because of her especially strong interest in conditions of the horse eye, Karen has enjoyed taking numerous courses on equine-specific ophthalmology over the years and has become adept at treating and managing challenging “eye” cases. Outside of work Karen enjoys running, hiking and spending time with friends and family (of both the 2 and 4-legged variety).



Julie Wilkins, DVM

Dr. Suzanne BrennerDr. Wilkins was born and raised in Ennis, Montana. She attended North Idaho College for 2 years of undergraduate study and then attended Albertson College of Idaho the following 2 years. Dr. Wilkins received her Doctor of Veterinary Medicine degree from Colorado State University in May of 2001. She did an internship at Pioneer Equine Hospital immediately following graduation and then stayed on as an associate veterinarian for 5 years. Dr. Wilkins' clinical focus and advanced training is in diagnostic ultrasound, and she is at Pioneer Equine Hospital on Thursdays. When not traveling with her ultrasound machine, she enjoys spending time team roping, starting and training young horses, and helping her husband, Todd with their cow/calf operation.

Suzanne Brenner, DVM

Dr. Suzanne Brenner Dr. Brenner graduated from UC Davis in 1994 with a B.S. in Animal Science with an equine emphasis and earned her Doctorate of Veterinary Medicine in 2003. Upon graduation, she entered general equine practice for three years and then returned to UC Davis for a Large Animal Ultrasound Internship 2006-2007. Her internship was followed by employment as a staff veterinarian in the equine ultrasound department at Davis. In late 2007, Dr. Brenner established an equine ultrasound consultation practice offering services to Pioneer Equine Hospital. Additionally, Dr. Brenner is currently the veterinary anatomy and physiology instructor at the Modesto Junior College within the veterinary technician program. Her professional interests lie in diagnostic imaging for musculoskeletal injuries and internal medicine. Similarly, her non-profession interests lie in all things horse related, including a weak attempt at returning to 3 day eventing on any one of her rescued horses.



Jody Hallstrom, DVM

Dr. Suzanne Brenner Dr. Hallstrom grew up in her father’s small animal veterinary clinic in the East Bay Area, but she never outgrew the “horse bug”. She received her Bachelor of Science degree in Biology from UCLA in 1995, and her Doctorate of Veterinary Medicine from UC Davis in 2000. She has worked in general equine practice in the Central Valley for 12 years. Her professional interests include dentistry, mare and foal care, preventative and internal medicine, and endocrinology. In her spare time she can be found attempting dressage on one of her three horses, hiking, and bird-watching.






Natasha Lefkowitz, DVM

Dr. Suzanne BrennerDr. Lefkowitz graduated veterinary school from University of California, Davis in 2004.  Following graduation she completed an equine internship at Steinbeck Country Equine Clinic. In 2005 she went on to complete a lameness fellowship at Pioneer Equine Hospital, where she worked with renowned lameness expert Dr. Jerry Black.  After completing her lameness fellowship, Dr. Lefkowitz opened an ambulatory practice in Portland, Oregon where she focused on Equine Sports Medicine, Dentistry and Wellness Care.  After 7 years in Oregon, Dr. Lefkowitz has returned to her native California to practice with Pioneer Equine Hospital.  She is very excited to be back.
Dr. Lefkowitz has been riding and competing horses most of her life, and is especially passionate about the disciplines of 3-day eventing and dressage.