Hannes graduated from the UVM Vienna in 2001 and completed an internship at the Small Animal Hospital of the School of Veterinary Medicine Hannover. Following research in perioperative pain therapy he achieved his Doctorate degree in 2003. After one year in small animal practice he started a three year residency in Small Animal Surgery at the University of Berne. Hannes has worked in multidisciplinary referral hospitals in the UK since 2007 and became a Diplomate of the European College of Veterinary Surgeons in 2008 and is also an RCVS recognised Specialist in Small Animal Surgery. He has established his independent "Oxford Veterinary Specialists" referral service in 2016. Hannes is surgery course director for Improve International and the editor of the Improve Surgery Textbook.