Dr. Nielsen has authored 60 peer-reviewed papers and nearly 200 book chapters, conference papers, and abstracts, and has secured $1.8 million in research funding. In addition, he has often been invited to speak to various audiences having given over 50 invited international talks in countries such as Australia, Austria, Brazil, Canada, England, France, Germany, Mexico, Northern Ireland, Norway, Spain, Slovenia, Sweden, Turkey, and the United Arab Emirates. He also has given dozens of invited talks at national meetings and within the state of Michigan.
He frequently writes articles for popular press publications such as the Thoroughbred Times, Speedhorse, and the American Quarter Horse Racing Journal. He is an active member of the American Society of Animal Science, the American Registry of Professional Animal Scientists, and served as the President of the Equine Science Society " an organisation that presented him with the "American Feed Industry Association Award in Equine Nutrition Research" in 2017 and the "Outstanding Young Equine Professional Award" in 2001.
Additionally, he was awarded the "Outstanding Teacher Award" at the Midwest Section of the American Society of Animal Science and the American Dairy Science Association in 2005 and the "Equine Science Award" by the American Society of Animal Science and Equine Science Society in 2010. Besides having served on the editorial board for the Journal of Animal Science, the Journal of Equine Veterinary Science, The Professional Animal Scientist, and the international journals Comparative Exercise Physiology and the Journal of Istanbul Veterinary Sciences, he is a Diplomat in the American College of Animal Nutritionists and served on the National Academy of Sciences Committee on Nutrient Requirements of Horses.
Throughout his academic career, he maintained involvement in the racing industry by breaking and galloping racing Quarter Horses and Thoroughbreds for over 25 years.