Who We Are

Karl Kraus, DVM, MS

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

William Hoefle, DVM, MS

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. Eric Zellner

Dr. Eric Zellner

Dr. Zellner is originally from Michigan and graduated from Michigan State University. He has combined his enthusiasm for sports and helping animals by maintaining involvement in the ISU IronDog Fund. He completed a residency at Iowa State.


Dr. Jaron Naiman

Dr. Jaron Naiman

Dr. Jaron Naiman grew up in sunny southern California and obtained his undergraduate degree in biology at UCLA. He attended veterinary school at the University of California Davis, and he just finished a Small Animal Rotating internship at Animal Specialty Group in Los Angeles. Dr. Naiman is interested in the application of minimally invasive surgical treatments for small animal patients. Dr. Naiman is in his first year of surgical training.