G. Gregory Haff, PhD, CSCS*D, FNSCA, ASCC,is a senior lecturer of strength and conditioning at Edith Cowan University in Perth, Australia. Haff has published more than 50 articles, centering his research on performance effects in the areas of strength training, cycling, and nutritional supplementation.A frequent presenter at national conferences on the topic of periodization, Haff has presented his research on the periodization of strength training to sport scientists at the Beijing Sport University in China in 2009 and 2001, at the United Kingdom Strength and Conditioning Association in Belfast 2008, and throughout the United States at National Strength and Conditioning Association conferences. Haff also received a Distinguished Teaching Award from West Virginia University School of Medicine in 2008. In 2001, he was the recipient of the National Strength and Conditioning Association (NSCA) Young Investigator of the Year Award.Haff applies his research as a regional weightlifting coach, level 3 cycling coach, certified strength and conditioning specialist with distinction, and accredited strength and conditioning coach with the United Kingdom Strength and Conditioning Association. He has also worked as a coach and consultant for national-level and international-level weightlifters and cyclists as well as numerous collegiate athletes.A fellow of the NSCA, Haff has served on the association's board of directors since 2007. He is also a member of the European College of Sport Science. Haff served on the USA Weightlifting Sports Medicine Committee (1998-2004), USA Weightlifting Sport Science Committee (1997-2004), NSCA Research Committee (2000-2006), and United States Olympic Committee Performance Enhancement Team for Weightlifting (2003-2004).A competitive weightlifter at the national level for 14 years, Haff continues to enjoy weightlifting in his free time as well as cycling and cooking. Haff resides in Joondalup, Western Australia, with his wife, Erin.Charles Dumke, PhD,is a professor in the department of health and human performance at the University of Montana, where he teaches undergraduate and graduate courses. He has taught courses in exercise physiology for over 10 years, first at Appalachian State University and then at the University of Montana. He earned his PhD in kinesiology from the University of Wisconsin at Madison, where he also served as a graduate teaching assistant. His areas of interest in exercise science are energy expenditure, fuel utilization, economy of movement, mechanisms of mitochondrial adaptation, and diabetes. He has published more than 50 peer-reviewed articles on these topics.Dumke is a certified ACSM health/fitness instructor. In 2007, he was made a fellow of the American College of Sports Medicine. He also earned the Dean’s Award for Excellence in Graduate Education from Appalachian State University.In his free time, Dumke enjoys competing in triathlons, biking, and swimming. He resides in Missoula, Montana, with his wife, Shannon.