Holger is currently Professor of Small Animal Diseases and the Head of Department of Small Animal Medicine and Surgery, University of Veterinary Medicine Hanover, Visiting Professor of Veterinary Neurology and Neurosurgery, Royal Veterinary College, London and Affiliate Professor of Veterinary Neurology, University of Copenhagen. He graduated from the University of Veterinary Medicine Hanover in 2001, where he also did his PhD in Neuropharmacology studying basic mechanisms of drug-resistant epilepsy. He then completed his specialist clinical education doing an internship and a residency in Neurology and Neurosurgery at the Royal Veterinary College (RVC). 

He has been a recipient of several Jim Bee educator excellent in teaching awards, Professor of the year in Germany (2nd rank biomedical sciences, Unicum), the prestigious Bourgelat Award and also the Woodrow from BSAVA, and the International Canine Health Award from the Kennel Club, the RCVS International and WSAVA Scientific Achievement Award. Holger also became fellow of the RCVS for Meritorious Contributions to Clinical Practice in 2022. He has published multiple books and book chapters, >350 articles, >230 conference abstracts, and is a frequent flyer on the international conference circuit.