Our Veterinarians

Compassionate and High Quality Care

Brad Jackman
DVM, MS, ACVS
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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 three 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
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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 Masters of Veterinary Science at the Western College of Veterinary Medicine in Saskatoon, Saskatchewan. He became a diplomat 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
DVM
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A graduate of Colorado State University, College of Veterinary Medicine and Biomedical Sciences, Dr. Jackman joined Pioneer in 2010. Originally from Boksburg, South Africa, Dr. Jackman 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, other outdoor activities, and spending time with family and friends (of both the 2- and 4-legged variety).

Jody Hallstrom
DVM
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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 worked in general equine practice in the Central Valley for 12 years before joining the Pioneer team in 2012. Her professional interests include dentistry, mare and foal care, preventive 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.

Kami Vickerman
DVM, CVA
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Dr. Vickerman was born and raised in Minnesota where she grew up with a variety of horses and animals on her family’s small hobby farm. She received her Bachelor of Science degree and Doctorate of Veterinary Medicine degree at the University of Minnesota. Ready to leave the cold snow of Minnesota, she completed her internship at Pioneer Equine Hospital in 2014 and then stayed on as an associate. She received her acupuncture certification from the Chi Institute in 2017. Her professional interests include acupuncture, ophthalmology, and preventive and geriatric medicine, though she truly enjoys all aspects of being a general practitioner. Outside of work, Dr. Vickerman enjoys gardening, hiking, backpacking, and spending time with family and friends.

Jen Williams
DVM
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Dr. Williams was born and raised in Santa Cruz, CA. From a young age she convinced her parents that she was going to be a doctor for horses. By age 10 she talked them into buying her first horse and so began a long and varied riding career. While western pleasure and rodeo dominated the start of her career, in college she branched out to the fields of dressage, eventing and hunter/jumpers.

 

Dr. Williams obtained her undergraduate degree in Animal Science with an equine emphasis in 2000 from UC Davis. She then attended 2 years of graduate school in immunology while performing lab research in equine arthritis. In 2006, Dr. Williams graduated from the UC Davis School of Veterinary Medicine with a Doctorate in Veterinary Medicine. Since that time Dr. Williams has been practicing ambulatory medicine in the East Bay Area. Her practical interests include dentistry, sport horse lameness, and diagnostics.

 

Dr. Williams spends her free time honing her riding skills with her focus now on hunters and dressage. When she is not riding, Dr. Williams can be found spending time with her family.

 

Maggie Peitzmeier
DVM, ACVS
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Dr. Maggie Peitzmeier grew up outside of Omaha, Nebraska riding and showing Quarter Horses. She has always loved animals and her dreams of being an equine surgeon were first documented in kindergarten. Dr. Peitzmeier attended the University of Nebraska-Lincoln where she competed on the equestrian team and received her Bachelor’s in Animal Science. She completed veterinary school through the University of Nebraska/Iowa State University program. After graduation, Dr. Peitzmeier moved to Ocala, FL and completed an internship and surgical residency at Peterson & Smith Equine Hospital and became board certified in large animal surgery. She has practiced in the Central Valley since 2016 and joined the Pioneer family in 2019. Outside of work, Dr. Peitzmeier enjoys riding her horse, working out, cheering on Husker football, and spending time with family and friends.

Julie Wilkins
DVM
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Dr. Wilkins was born and raised in Ennis, Montana. She attended North Idaho College for two years of undergraduate study and then attended Albertson College of Idaho the following two years. Dr. Wilkins received her Doctor of Veterinary Medicine degree from Colorado State University in 2001. She did an internship at Pioneer Equine Hospital immediately following graduation and then stayed on as an associate veterinarian for five years. Dr. Wilkins’ clinical focus and advanced training is in diagnostic ultrasound, and she is usually at Pioneer Equine Hospital one day a week. 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
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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 from 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-professional interests lie in all things horse related, including a weak attempt at returning to 3-day eventing on any one of her rescued horses.