William E. "Bill" DeTurk, PT, PhD, is Clinical Associate Professor of Physical Therapy at Stony Brook University (SUNY) in Stony Brook, New York. He also works as a Consultant to the Cardiac & Pulmonary Rehabilitation Program at the VA Medical Center in Northport, New York. Lawrence P. "Larry" Cahalin, PT, MS, CCS, is an APTA Board Certified Cardiopulmonary Clinical Specialist who was part of the initial 5-member panel of physical therapists who developed the APTA Preferred Practice Patterns in Cardiovascular and Pulmonary Physical Therapy. He has been actively involved in clinical research and clinical practice in cardiovascular and pulmonary physical therapy for over 20 years and is currently Senior Clinical Professor in the Department of Physical Therapy at Northeastern University in Boston, Massachusetts. His current research and clinical interests include the development of hypothesis-oriented algorithms for the examination and treatment of persons with heart and lung disease and better understanding breathing in persons with heart and lung disease.