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Who We Are


Dr. Kraus

Karl Kraus DVM, MS, Diplomate ACVS

Professor and Section Head


Karl H. Kraus is Chief of Small Animal Surgery at Lloyd Veterinary Medical Center at Iowa State University and diplomat of the American College of Veterinary Surgeons.  He graduated from Kansas State University in 1985, completed residency training at University of Missouri-Columbia in 1989 and was professor of surgery at Tufts University from 1989 to 2007.  He also held a joint appointment at Harvard University where he helped develop neurosurgical procedures on humans at Brigham and Women’s Hospital from 1989 to 1998.  He was founder of Securos Veterinary Orthopedics and Chair of the Board of Directors from 1997 to 2007.  He is the inventor of the Securos External Fixator System, bone anchor and Cruciate Repair System, and SOP plating system.   His major areas of interest include fracture repair, external fixation, ACL repair, spinal stabilization, and neurosurgery.


Dr. Hoefle

William Hoefle DVM, MS, Diplomate ACVS




Clinical and research interests: Dr. Hoefle's clinical research interests include total hip prosthesis, bone grafts and osteosarcoma treatment.




Dr. Toombs

James Toombs DVM, MS, Diplomate ACVS



Clinical and research interests: Small animal orthopedic surgery, external skeletal fixation, and small animal neurosurgery.






Mary Sarah Bergh DVM, MS, Diplomate ACVS, Diplomate ACVSMR

Assistant Professor


Dr. Bergh is an Assistant Professor of Orthopedic Surgery and the Director of the Canine Rehabilitation Center at Iowa State University College of Veterinary Medicine. She has earned board certifications from the American College of Veterinary Surgeons (ACVS) and the American College of Veterinary Sports Medicine and Rehabilitation (ACVSMR).  She attended veterinary school at the University of Wisconsin, completed an internship University of Pennsylvania and a residency in small animal surgery at The Ohio State University College of Veterinary Medicine. She also earned her Masters of Science degree at The Ohio State University in 2008, while investigating fractured central tarsal bones of racing greyhounds. Her clinical and research interests include hip, knee and elbow joint replacement, arthroscopy, treatments for cranial cruciate ligament disease including TPLO/TTA, rehabilitation and racing/athletic injuries.





Dr. Andrew Burton


Dr. Burton is in his third year of surgical training. 


Dr. Eric Zellner

Dr. Zellner is in his second year of surgical training.




Dr. Scott Christopher

Dr. Christopher is in his first year of surgical training.










Tara Akers


Tara grew up in Ames and has lived here most of her life. She received a AAS degree in Veterinary Technology from Des Moines Area Community College in Ankeny, IA in 2006. After graduation, she worked in a small animal practice and became the head technician. She worked there for almost 5 years prior to joining the ISU LVMC. She enjoys doing yard work, being outdoors, reading, and spending time with her daughters.


Amy Dennis


Amy grew up in Granger, Iowa, she graduated from Iowa State University in 2006 with a BA in Advertising and a minor in Spanish. After working in Kansas City for a few years, she left the marketing world and returned to school to pursue a much more fitting career as a Veterinary Technician, graduating from DMACC in 2012. Amy loves being outdoors and has a beloved shelter-rescued lab mix named Rylea.


Diane Perry


Diane Perry received certification as a veterinary technician from the University of Minnesota, Waseca in 1984.   She worked for 3 years in private practice in the Des Moines area before joining the surgery department at Iowa State University in 1987.  Diane currently enjoys working in the Sophomore and Junior teaching labs during the school year and assisting the surgery department during the summer months. When not working, Diane enjoys spending time with her family and 2 Brittanys, doing almost any kind of outdoor activity.

Rachael Rail