Nicole Pfaller-Sadovsky, PhD, is a behavioral scientist specializing in human-dog interactions, animal welfare, and ethology. She completed her PhD in Biological Sciences at Queen's University Belfast and is currently a Visiting Scholar at the university's School of Biological Sciences. Additionally, she teaches applied ethology as an Adjunct Instructor at Virginia Tech.

Dr. Pfaller-Sadovsky founded Happy-Fellow® Coaching & Seminars in 2008, a business focused on positive-reinforcement based dog training. Her research interests include the development of evidence-based and welfare-centered interventions for dogs and their owners​. She is also interested in conducting research on the potential impact of companion animals on climate change, as well as exploring possible mitigation strategies and the resulting interventions and policies.