Dr. Nielsen graduated with his DVM degree from the Royal Veterinary and Agricultural University, Denmark in 2001. He spent three years in equine veterinary practice before joining graduate school. He received his Ph.D. in equine parasitology at University of Copenhagen in 2007 and served as assistant professor there until 2011. He then joined the M.H. Gluck Equine Research Center at University of Kentucky where he now serves as associate professor and holds the title of Schlaikjer Professor in Equine Infectious Disease. He is board certified in veterinary parasitology with European Veterinary Parasitology College (EVPC) and with American College of Veterinary Microbiologists (ACVM). Dr. Nielsen is chair of the AAEP Parasite Control Subcommittee which published its guidelines in 2013. He currently serves as co-editor in chief for the scientific journal Veterinary Parasitology. He has published more than 120 peer-reviewed publications, over 200 conference abstracts, and is co-author of Handbook of Equine Parasite Control.