Garrett Fitzmaurice is Professor of Psychiatry (Biostatistics) at the Harvard Medical School, Professor in the Department of Biostatistics at the Harvard School of Public Health and Foreign Adjunct Professor of Biostatistics at the Karolinska Institute, Sweden. He is a Fellow of the American Statistical Association and a member of the International Statistical Institute. He has served as Associate Editor for the Journal of the Royal Statistical Sociery (Series B), Biometrics and Biostatistics; currently, he is Statistics Editor for the journal Nutrition. His research and teaching interests are in methods for analyzing longitudinal and repeated measures data. A major focus of his methodological research has been on the development of statistical methods for analyzing repeated binary data and for handling the problem of attrition in longitudinal studies. Much of his collaborative research has concentrated on applications to mental health research, broadly defined. He recently completed an edited book on Longitudinal Data Analysis.

Nan Laird is Professor of Biostatistics at the Harvard School of Public Health. She is a Fellow of the American Statistical Association and the Institute of Mathematical Statistics and a member of the International Statistical Institute. She has been involved in all aspects of longitudinal data analysis for over 20 years: teaching, methodological and applied research. Her methodological research has focused on likelihood-based methods for both discrete and continuous outcomes, and on missing data. She has collaborated on longitudinal studies in nutrition, psychiatry, and environmental health, and in longitudinal clinical trials. She is author of an IMS monograph on Analysis of Longitudinal and Cluster-Correlated Data and co-author of a text on The Fundamentals of Modern Statistical Genetics.

James Ware is Frederick Mosteller Professor of Biostatistics and Dean for Academic Affairs at the Harvard School of Public Health. He is a Fellow of the American Statistical Association and a member of the International Statistical Institute. His research interests focus on methods for the design and analysis of longitudinal and environmental data, and on the application of biostatistics to environmental epidemiology and clinical research. His research has led to new methodology for the analysis of longitudinal studies of the health effects of air pollutants. He is co-author of the book, Biostatistics for Clinical Medicine, and has been a statistical consultant to the New England Journal of Medicine since 1991.