The allocated page space would not afford us ample opportunity to properly acknowledge all of the generous contributions from the FA Davis team, colleagues, students, family, and friends who have provided valuable support throughout the creation of this 4th Edition. Special thanks are directed to Teresa Prince (photographer) and the Emory DPT student models (Mathew Ayers and Kelsey Gilman) for the photographs that appear for the first time in this edition. Thank you one and all!