Dr. Harrus studied veterinary medicine at the Faculty of Veterinary Science, University of Pretoria and Koret School of Veterinary Medicine, The Hebrew University of Jerusalem, Israel where he received his DVM. He received his PhD from Utrecht University, Faculty of Veterinary medicine, The Netherlands. Over the years Dr. Harrus has held many important positions at The Hebrew University, including full Professor of Veterinary Medicine (2014-present), Director, Koret School of Veterinary Medicine (2007-2015), Member of the Board of Directors of the Veterinary Teaching Hospital (2007-2015), Member of the Central Reception Committee for Students (2007-2011) ,Member of the Curriculum Committee, Koret School of Veterinary Medicine (2007-Present), Member of the Board of Directors of The Authority for Animal Facilities/The Authority for Biological and Biomedical Models (2008-2015), and is the Chair of the Committee for Development and Academic Planning for the Koret School of Veterinary Medicine (2015-Present). He was the Associate Editor of the Israel Journal of Veterinary Medicine (1994-2004), Member of the Advisory Board of the Uludag University Journal of the Faculty of Veterinary Medicine (2003-2012), Member of the Editorial Board of the Veterinary Clinical Pathology Journal (2004-2008), and Member of the Editorial Board of the Israel Journal of Veterinary Medicine (2004-2008). Dr. Harrus has also been a member of international professional committees including the International Selection Committee of PennVet World Award for Leadership in Animal Health nominating and selecting distinguished contributors to the veterinary medicine profession (2008-2012), Member of the Executive Committee of the European Association of Establishments for Veterinary Education (EAEVE; 2012-2015), has since 2013 to 2017 been a Member of the Management Committee, European Cooperation in Science and Technology (COST), European Network for Neglected vectors and Vector-Borne infections (EURNEGVEC), is an External Member of the Promotion Committee of the Faculty of Veterinary Medicine, Aristotle University of Thessaloniki, Thessaloniki, Greece (2015-present), and a Reviewer in 2016and 2017, of national research grants for the Slovenian Research Agency (ARRS).
He has written a dozen chapters in professional veterinary books and published more than 120 Peer Reviewed research papers. Dr. Harrus & Dr. Gad Baneth are also the patent owners and inventors of the Attenuated Ehrlichiosis Vaccine. Approved US Patent, Accession number PCM B/00023; European Patent Application 08789876.3; Israeli Patent Application 204404.