A registered clinical psychologist, Thomas W. Phelan, Ph.D., has worked with children, adults and families for over 40 years.
The author of numerous books, DVDs and audios, he is best known for his ground-breaking book, 1-2-3 Magic: 3 Step Discipline for Calm, Effective, and Happy Parenting, which has sold over 2 million copies and is now in its 6th edition.

https://www.123magic.com/