To all the women and men worldwide who have participated in research studies to advance our knowledge about bone health.

To fellow bone researchers who ask the right questions and pursue the answers.

To the physicians whose contributions to my career made this book possible:

Mary G. Barry (Associate Professor [Clinical] of Medicine, University of Louisville), who started the journey with me in medical school;

H. Kenneth Walker (Professor of Medicine and Associate Vice Chair for Grady Hospital, Emory University), who shared his passion for teaching and compassion for patients;

Nelson Watts (Professor of Medicine, University of Cincinnati and Director of the University Bone Health and Osteoporosis Center), who introduced me to the area of osteoporosis during my training at Emory;

Joe W. Ramsdell (Professor of Medicine, Chief of General Internal Medicine, University of California, San Diego), who gave me the opportunity to become an epidemiologist as a junior faculty member; and

Elizabeth Barrett-Connor (Distinguished Professor of Family and Preventive Medicine, University of California, San Diego), who mentored me and shared not only research opportunities but life lessons.