Lea Pulkkinen is Professor of Psychology, Emerita, at the University of Jyvaskyla in Finland. She is the Director of the program on Human Development and Its Risk Factors and of the Psykocenter in the Finnish Centre of Excellence Program. She was President of the International Society for the Study of Behavioural Development (ISSBD) in 1991-1996. She also has served as the Dean of the Faculty of Social Sciences, Head of the Department of Psychology, Director of Family Research Center, Vice-Director of the Agora Center, and on a number of national committees including the Science and Technology Policy Council of Finland. She received the Finnish Science Award from the Ministry of Education in 2001 as well as many other national awards. In 2003, she received the Aristotle Prize from the European Federation of Psychologists' Associations (EFPA) and in 2005 she received the Distinguished Scientific Contributions to Child Development Award from the Society for Research in Child Development in USA. She has conducted an ongoing longitudinal study (JYLS) since 1968 funded by the Academy of Finland and collaborated in a twin study (FinnTwin 12) since 1991. She has over 350 original publications in several journals on human development and has edited the book, Paths to Successful Development, with Dr Avshalom Caspi (Cambridge University Press, 2002). Jaakko Kaprio is Professor of Genetic Epidemiology at the University of Helsinki and Research Professor in Behavioral Genetics at the National Public Health Institute. He has worked with the Finnish Cohort studies since 1976 and has been responsible for a steady expansion of the included cohorts and very extensive phenotyping through repeated questionnaire and interview surveys and recording-linkage to national medical registries. He is an internationally recognized expert in epidemiology and twin studies with over 350 original scientific publications, continuous NIH funding for the past 20 years, and he was recently elected President of the International Society for Twin Studies. He has published in leading medical journals such as the NEJM, JAMA, Lancet, Nature Genetics, Nature Neuroscience, BMJ and PLoS Medicine. Richard J. Rose is Professor of Psychology and Medical Genetics at Indiana University. He was a founding member of the Behavior Genetics Association and has served as its president. He has been the Principal Investigator on NIH grant awards for the two FinnTwin studies. He has been a Senior Fellow of the Fogarty International Foundation of NIH and has received a NATO Travelling Scholar Award and a Senior Research Fellowship from the National Institutes of Health. His most recent research grant, awarded for continuation of FinnTwin research, was converted to MERIT award status. He serves on the Behavior Genetics and Epidemiology Study Section (BGES), National Institutes of Health. Trained as a Clinical Psychologist, his expertise is in developmental behavior genetics. His research places as much focus on environmental influences within families, schools, and neighborhoods, as on genetic dispositions in developmental transitions from early adolescence to early adulthood.

• Preface; Introduction Richard J. Rose; Part I. Longitudinal and Behavior Genetic Approaches: 1. The Jyväskylä longitudinal study of personality and social development (JYLS) Lea Pulkkinen; 2. Genetic and environmental influences on social behavior and health Richard J. Rose; 3. Social behaviors and health in twins: the FinnTwin studies Jaakko Kaprio; Part II. Adolescent Health-related Behavior and Adult Health: 4. Body size and overweight from birth to adulthood Marja-Liisa Kinnunen, Kirsi Pietiläinen and Aila Rissanen; 5. Pubertal development and health-related behavior Danielle M. Dick and Brian Mustanski; 6. Genetic and environmental influences on the initiation and continuation of smoking and drinking Danielle M. Dick, Satu Barman and Tuuli Pitkänen; 7. Self-rated health: precursors of and implications Karri Silventoinen, Eero Lahelma and Jaakko Kaprio; Part III. Socioemotional Behavior in Early Adolecence: 8. Genetic and environmental factors in girls' and boys' socioemotional behavior Elina Vierikko and Lea Pulkkinen; 9. Emotion regulation and wellbeing Marja Kokkonen and Marja-Liisa Kinnunen; 10. Parental knowledge and family atmosphere in relation to children's socioemotional behavior Riitta-Leena Metsäpelto and Petri Juujärvi; 11. Parental work and children's behavior: the mediator roles of partner relationship and parenthood Ulla Kinnunen and Johanna Rantanen; 12. Grandparents as resource factors in the family Helena Hurme; Part IV. Life Course and Health: 13. Identity formation, personal control over development, and well-being Päivi Fadjukoff and Lea Pulkkinen; 14. Sense of coherence and optimism: a more positive approach to health Taru Feldt, Anne Mäkikangas and Kaisa Aunola; 15. Unemployment, psychological distress, and education as a resource factor for employment Katja Kokko; 16. Personality, work career and health Mika Kivimäki, Marianna Virtanen, Marko Elovainio and Jussi Vahtera; Summary and future directions Lea Pulkkinen Jaakko Kaprio and Richard J. Rose.

Lea Pulkkinen is Professor of Psychology, Emerita, at the University of Jyvaskyla in Finland. She is the Director of the program on Human Development and Its Risk Factors and of the Psykocenter in the Finnish Centre of Excellence Program. She was President of the International Society for the Study of Behavioural Development (ISSBD) in 1991-1996. She also has served as the Dean of the Faculty of Social Sciences, Head of the Department of Psychology, Director of Family Research Center, Vice-Director of the Agora Center, and on a number of national committees including the Science and Technology Policy Council of Finland. She received the Finnish Science Award from the Ministry of Education in 2001 as well as many other national awards. In 2003, she received the Aristotle Prize from the European Federation of Psychologists' Associations (EFPA) and in 2005 she received the Distinguished Scientific Contributions to Child Development Award from the Society for Research in Child Development in USA. She has conducted an ongoing longitudinal study (JYLS) since 1968 funded by the Academy of Finland and collaborated in a twin study (FinnTwin 12) since 1991. She has over 350 original publications in several journals on human development and has edited the book, Paths to Successful Development, with Dr Avshalom Caspi (Cambridge University Press, 2002). Jaakko Kaprio is Professor of Genetic Epidemiology at the University of Helsinki and Research Professor in Behavioral Genetics at the National Public Health Institute. He has worked with the Finnish Cohort studies since 1976 and has been responsible for a steady expansion of the included cohorts and very extensive phenotyping through repeated questionnaire and interview surveys and recording-linkage to national medical registries. He is an internationally recognized expert in epidemiology and twin studies with over 350 original scientific publications, continuous NIH funding for the past 20 years, and he was recently elected President of the International Society for Twin Studies. He has published in leading medical journals such as the NEJM, JAMA, Lancet, Nature Genetics, Nature Neuroscience, BMJ and PLoS Medicine. Richard J. Rose is Professor of Psychology and Medical Genetics at Indiana University. He was a founding member of the Behavior Genetics Association and has served as its president. He has been the Principal Investigator on NIH grant awards for the two FinnTwin studies. He has been a Senior Fellow of the Fogarty International Foundation of NIH and has received a NATO Travelling Scholar Award and a Senior Research Fellowship from the National Institutes of Health. His most recent research grant, awarded for continuation of FinnTwin research, was converted to MERIT award status. He serves on the Behavior Genetics and Epidemiology Study Section (BGES), National Institutes of Health. Trained as a Clinical Psychologist, his expertise is in developmental behavior genetics. His research places as much focus on environmental influences within families, schools, and neighborhoods, as on genetic dispositions in developmental transitions from early adolescence to early adulthood.

• Preface; Introduction Richard J. Rose; Part I. Longitudinal and Behavior Genetic Approaches: 1. The Jyväskylä longitudinal study of personality and social development (JYLS) Lea Pulkkinen; 2. Genetic and environmental influences on social behavior and health Richard J. Rose; 3. Social behaviors and health in twins: the FinnTwin studies Jaakko Kaprio; Part II. Adolescent Health-related Behavior and Adult Health: 4. Body size and overweight from birth to adulthood Marja-Liisa Kinnunen, Kirsi Pietiläinen and Aila Rissanen; 5. Pubertal development and health-related behavior Danielle M. Dick and Brian Mustanski; 6. Genetic and environmental influences on the initiation and continuation of smoking and drinking Danielle M. Dick, Satu Barman and Tuuli Pitkänen; 7. Self-rated health: precursors of and implications Karri Silventoinen, Eero Lahelma and Jaakko Kaprio; Part III. Socioemotional Behavior in Early Adolecence: 8. Genetic and environmental factors in girls' and boys' socioemotional behavior Elina Vierikko and Lea Pulkkinen; 9. Emotion regulation and wellbeing Marja Kokkonen and Marja-Liisa Kinnunen; 10. Parental knowledge and family atmosphere in relation to children's socioemotional behavior Riitta-Leena Metsäpelto and Petri Juujärvi; 11. Parental work and children's behavior: the mediator roles of partner relationship and parenthood Ulla Kinnunen and Johanna Rantanen; 12. Grandparents as resource factors in the family Helena Hurme; Part IV. Life Course and Health: 13. Identity formation, personal control over development, and well-being Päivi Fadjukoff and Lea Pulkkinen; 14. Sense of coherence and optimism: a more positive approach to health Taru Feldt, Anne Mäkikangas and Kaisa Aunola; 15. Unemployment, psychological distress, and education as a resource factor for employment Katja Kokko; 16. Personality, work career and health Mika Kivimäki, Marianna Virtanen, Marko Elovainio and Jussi Vahtera; Summary and future directions Lea Pulkkinen Jaakko Kaprio and Richard J. Rose.