Harold Stolovitch is Emeritus Professor of Workplace Learning & Performance, Université de Montréal, where he also served as Associate Dean of Research and Chair of the Instructional & Performance Technology graduate programs. He has also been a Distinguished Visiting Scholar and Visiting Professor at the University of Southern California. He is a principal of HSA Learning & Performance Solutions LLC (www.hsa-lps.com), an international consulting firm. In this Q&A interview he discusses his definition of human performance technology, his motivation to begin writing the "Telling Ain't Training" series, main mistakes that trainers make, his opinion of mobile training, and what types of feedback--immediate or delayed--trainers should be providing.