Mark E. Feinberg, PhD, is Research Professor at the Prevention Research Center, The Pennsylvania State University and Director of the International Center for Coparenting Policy and Research, The Pennsylvania State University. He has made contributions to theory and research in areas such as co-parenting, sibling relationships, the epidemiology of adolescent behavior problems, and the efficacy of community prevention initiatives. He also developed the evidence-based Family Foundations program to promote positive co-parenting relations.D. Wayne Osgood, PhD, is Professor Emeritus of Criminology and Sociology at The Pennsylvania State University, University Park. His research has focused on peers and risky behavior, time use and offending, crime and the life course, evaluating programs to prevent and reduce delinquency, and quantitative research methods. He is a Fellow of the American Society of Criminology, received its Sutherland Award in 2022, and was Lead Editor of the journalCriminology for 2012–2017.

The impetus for this edited volume is the wealth of data that emerged from the ambitious PROSPER (Promoting School-Community-University Partnerships to Enhance Resilience) research study. PROSPER was a longitudinal investigation of two cohorts of students in grades 6-12, which incorporated experimental interventions and social network methodologies. Even though the scope of the book is limited to examining substance use, sexual behavior, contact with the criminal justice system, and other problematic adolescent behaviors, it is an ambitious undertaking.

• Section I: Setting the Stage Chapter 1: Friendships and Peer Groups in the Teen Years-Our PerspectiveD. Wayne Osgood Chapter 2: Overview of the PROSPER Prevention Trial's Rationale, Methods, and Findings: The Context for Friendship Network StudyRichard Spoth, Lisa M. Schainker, Mark Greenberg, and Janet Welsh Chapter 3: Network Methods: Explanations and IssuesJames Moody and D. Wayne Osgood Chapter 4: A Descriptive Overview of Social Networks and Behavior Among PROSPER YouthErin Tinney Section II: Risky Behaviors, Relationships, and Development Chapter 5: Teen Friendships, Networks, and Substance Use Daniel T. Ragan and D. Wayne Osgood Chapter 6: Does Criminal Justice Contact Alter Friendship Ties?Wade C. Jacobsen and Erin Tinney Chapter 7: Depression, Isolation, and Self-Harm Molly Copeland and Sonja Siennick Chapter 8: The Role of Parenting in Shaping the Friendship Context of Adolescent Substance Use Kelly L. Rulison, Avery Chahl, and Evelien M. Hoeben Chapter 9: Dating, Sexuality, and Adolescent Friendship NetworksNayan G. Ramirez, Rose Wesche, and Derek A. Kreager Chapter 10: Variation in Network Processes Across Community and School District ContextsCassie McMillan, Daniel Ragan, and Alana Colindres Chapter 11: Peer Networks and the Diffusion of Intervention Outcomes Kelly L. Rulison and Mark E. Feinberg Chapter 12: Genetic Susceptibility to PeersGabriel L. Schlomer, Amanda M. Griffin, H. Harrington Cleveland, and David J. Vandenbergh Section III: Discussion and Conclusions Chapter 13: Future Directions for Research on Networks and Adolescent HealthThomas W. Valente Chapter 14: The Growth of Longitudinal Social Network AnalysisRené Veenstra, Teresa Bertogna, and Lydia Laninga-Wijnen Chapter 15: Social Capital and Adolescent DevelopmentMark Feinberg Publications of the PROSPER Peers ProjectPROSPER Peers Project Personnel

Mark E. Feinberg, PhD, is Research Professor at the Prevention Research Center, The Pennsylvania State University and Director of the International Center for Coparenting Policy and Research, The Pennsylvania State University. He has made contributions to theory and research in areas such as co-parenting, sibling relationships, the epidemiology of adolescent behavior problems, and the efficacy of community prevention initiatives. He also developed the evidence-based Family Foundations program to promote positive co-parenting relations.D. Wayne Osgood, PhD, is Professor Emeritus of Criminology and Sociology at The Pennsylvania State University, University Park. His research has focused on peers and risky behavior, time use and offending, crime and the life course, evaluating programs to prevent and reduce delinquency, and quantitative research methods. He is a Fellow of the American Society of Criminology, received its Sutherland Award in 2022, and was Lead Editor of the journalCriminology for 2012–2017.

The impetus for this edited volume is the wealth of data that emerged from the ambitious PROSPER (Promoting School-Community-University Partnerships to Enhance Resilience) research study. PROSPER was a longitudinal investigation of two cohorts of students in grades 6-12, which incorporated experimental interventions and social network methodologies. Even though the scope of the book is limited to examining substance use, sexual behavior, contact with the criminal justice system, and other problematic adolescent behaviors, it is an ambitious undertaking.

• Section I: Setting the Stage Chapter 1: Friendships and Peer Groups in the Teen Years-Our PerspectiveD. Wayne Osgood Chapter 2: Overview of the PROSPER Prevention Trial's Rationale, Methods, and Findings: The Context for Friendship Network StudyRichard Spoth, Lisa M. Schainker, Mark Greenberg, and Janet Welsh Chapter 3: Network Methods: Explanations and IssuesJames Moody and D. Wayne Osgood Chapter 4: A Descriptive Overview of Social Networks and Behavior Among PROSPER YouthErin Tinney Section II: Risky Behaviors, Relationships, and Development Chapter 5: Teen Friendships, Networks, and Substance Use Daniel T. Ragan and D. Wayne Osgood Chapter 6: Does Criminal Justice Contact Alter Friendship Ties?Wade C. Jacobsen and Erin Tinney Chapter 7: Depression, Isolation, and Self-Harm Molly Copeland and Sonja Siennick Chapter 8: The Role of Parenting in Shaping the Friendship Context of Adolescent Substance Use Kelly L. Rulison, Avery Chahl, and Evelien M. Hoeben Chapter 9: Dating, Sexuality, and Adolescent Friendship NetworksNayan G. Ramirez, Rose Wesche, and Derek A. Kreager Chapter 10: Variation in Network Processes Across Community and School District ContextsCassie McMillan, Daniel Ragan, and Alana Colindres Chapter 11: Peer Networks and the Diffusion of Intervention Outcomes Kelly L. Rulison and Mark E. Feinberg Chapter 12: Genetic Susceptibility to PeersGabriel L. Schlomer, Amanda M. Griffin, H. Harrington Cleveland, and David J. Vandenbergh Section III: Discussion and Conclusions Chapter 13: Future Directions for Research on Networks and Adolescent HealthThomas W. Valente Chapter 14: The Growth of Longitudinal Social Network AnalysisRené Veenstra, Teresa Bertogna, and Lydia Laninga-Wijnen Chapter 15: Social Capital and Adolescent DevelopmentMark Feinberg Publications of the PROSPER Peers ProjectPROSPER Peers Project Personnel

Mark E. Feinberg, PhD, is Research Professor at the Prevention Research Center, The Pennsylvania State University and Director of the International Center for Coparenting Policy and Research, The Pennsylvania State University. He has made contributions to theory and research in areas such as co-parenting, sibling relationships, the epidemiology of adolescent behavior problems, and the efficacy of community prevention initiatives. He also developed the evidence-based Family Foundations program to promote positive co-parenting relations.D. Wayne Osgood, PhD, is Professor Emeritus of Criminology and Sociology at The Pennsylvania State University, University Park. His research has focused on peers and risky behavior, time use and offending, crime and the life course, evaluating programs to prevent and reduce delinquency, and quantitative research methods. He is a Fellow of the American Society of Criminology, received its Sutherland Award in 2022, and was Lead Editor of the journalCriminology for 2012–2017.

The impetus for this edited volume is the wealth of data that emerged from the ambitious PROSPER (Promoting School-Community-University Partnerships to Enhance Resilience) research study. PROSPER was a longitudinal investigation of two cohorts of students in grades 6-12, which incorporated experimental interventions and social network methodologies. Even though the scope of the book is limited to examining substance use, sexual behavior, contact with the criminal justice system, and other problematic adolescent behaviors, it is an ambitious undertaking.

• Section I: Setting the Stage Chapter 1: Friendships and Peer Groups in the Teen Years-Our PerspectiveD. Wayne Osgood Chapter 2: Overview of the PROSPER Prevention Trial's Rationale, Methods, and Findings: The Context for Friendship Network StudyRichard Spoth, Lisa M. Schainker, Mark Greenberg, and Janet Welsh Chapter 3: Network Methods: Explanations and IssuesJames Moody and D. Wayne Osgood Chapter 4: A Descriptive Overview of Social Networks and Behavior Among PROSPER YouthErin Tinney Section II: Risky Behaviors, Relationships, and Development Chapter 5: Teen Friendships, Networks, and Substance Use Daniel T. Ragan and D. Wayne Osgood Chapter 6: Does Criminal Justice Contact Alter Friendship Ties?Wade C. Jacobsen and Erin Tinney Chapter 7: Depression, Isolation, and Self-Harm Molly Copeland and Sonja Siennick Chapter 8: The Role of Parenting in Shaping the Friendship Context of Adolescent Substance Use Kelly L. Rulison, Avery Chahl, and Evelien M. Hoeben Chapter 9: Dating, Sexuality, and Adolescent Friendship NetworksNayan G. Ramirez, Rose Wesche, and Derek A. Kreager Chapter 10: Variation in Network Processes Across Community and School District ContextsCassie McMillan, Daniel Ragan, and Alana Colindres Chapter 11: Peer Networks and the Diffusion of Intervention Outcomes Kelly L. Rulison and Mark E. Feinberg Chapter 12: Genetic Susceptibility to PeersGabriel L. Schlomer, Amanda M. Griffin, H. Harrington Cleveland, and David J. Vandenbergh Section III: Discussion and Conclusions Chapter 13: Future Directions for Research on Networks and Adolescent HealthThomas W. Valente Chapter 14: The Growth of Longitudinal Social Network AnalysisRené Veenstra, Teresa Bertogna, and Lydia Laninga-Wijnen Chapter 15: Social Capital and Adolescent DevelopmentMark Feinberg Publications of the PROSPER Peers ProjectPROSPER Peers Project Personnel