Willem Kramer is a Netherlands-trained physiotherapist and US-licensed massage therapist with over thirty years of experience working with professional athletes, entertainers, and executives worldwide. He reorganizes anatomy around how the body moves, working from the premise that motion is a whole-body event involving all twelve organ systems within the anatomical planes of motion. He is the author of Anatomy by Planes — a three-atlas set with a foreword by Andrew Luck — and its companion Clinical & Training Guide, and the creator of Motion Anatomy (motionanatomy.com), a free introduction to the framework.