David Harp, MA, is president of Musical iPress, a music instruction publishing company, and of Harmony Productions, a public speaking and corporate training bureau based on his study of applied cognitive science. For Musical iPress, he created and produced over twenty instructional titles. For Harmony Productions, he organized and presented a variety of public speaking events.
Matthew McKay, PhD, is a professor at the Wright Institute in Berkeley, CA. He has authored and coauthored numerous books, including The Dialectical Behavior Therapy Skills Workbook, Self-Esteem, and Couple Skills, which have sold more than a million copies combined. He received his PhD in clinical psychology from the California School of Professional Psychology, and specializes in the cognitive behavioral treatment of anxiety and depression.