Vania Martínez is Associate Professor at the Faculty of Medicine of Universidad de Chile. She is a child and adolescent psychiatrist graduated from Universidad de Chile with a PhD in psychotherapy from Pontificia Universidad Católica de Chile. She is currently the Director of the Millennium Nucleus to Improve the Mental Health of Adolescents and Youths (Imhay) and Associate Researcher at the Millennium Institute for Research in Depression and Personality (MIDAP). Her main research lines focus on depression, suicidality, and digital mental health interventions for adolescents and young people.Claudia Miranda is Associate Professor at the Faculty of Nursing of Universidad Andrés Bello, Chile. She is a psychologist graduated from Universidad de Tarapacá, Chile, with a PhD in mental health and aging from the University College London, UK). She is currently the Director of the Millennium Institute for Caregiving Research (MICARE) and Associate Researcher at the Millennium Institute for Research in Depression and Personality (MIDAP). Her main research lines focus on the assessment and improvement of psychosocial aspects in older people and also on the implementation and evaluation of psychosocial interventions for people with dementia and their family caregivers.

• Chapter 1. Introduction.- Part I. Children, Adolescents, and Youths.- Chapter 2. Innovations in Closing the Global Prevention and Treatment Gap for Depression in Children, Adolescents, and Youths.- Chapter 3. Preventing Depression in Children and Adolescents Through Mindfulness-Based Interventions in Schools.- Chapter 4. Digital Technology Interventions for Preventing and Treating Youth Depression.- Chapter 5. Contemplation of Nature to Promote Mental Health and Prevent Depression in Youth.- Chapter 6. Internet-Based Interventions for Prevention and Early Treatment of Depression in Higher Education Students.- Part II. Adults and Older Adults.- Chapter 7. Interventions for Adult Depression in Primary Health Care Clinics.- Chapter 8. The Potential of Internet-based Psychological Interventions for Perinatal Depression Prevention and Treatment.- Chapter 9. Preventive and Early Treatment of Depression in Older Adults.- Chapter 10. Depressive Disorders Among Family Caregivers of People Living with Dementia.

Vania Martínez is Associate Professor at the Faculty of Medicine of Universidad de Chile. She is a child and adolescent psychiatrist graduated from Universidad de Chile with a PhD in psychotherapy from Pontificia Universidad Católica de Chile. She is currently the Director of the Millennium Nucleus to Improve the Mental Health of Adolescents and Youths (Imhay) and Associate Researcher at the Millennium Institute for Research in Depression and Personality (MIDAP). Her main research lines focus on depression, suicidality, and digital mental health interventions for adolescents and young people.Claudia Miranda is Associate Professor at the Faculty of Nursing of Universidad Andrés Bello, Chile. She is a psychologist graduated from Universidad de Tarapacá, Chile, with a PhD in mental health and aging from the University College London, UK). She is currently the Director of the Millennium Institute for Caregiving Research (MICARE) and Associate Researcher at the Millennium Institute for Research in Depression and Personality (MIDAP). Her main research lines focus on the assessment and improvement of psychosocial aspects in older people and also on the implementation and evaluation of psychosocial interventions for people with dementia and their family caregivers.

• Chapter 1. Introduction.- Part I. Children, Adolescents, and Youths.- Chapter 2. Innovations in Closing the Global Prevention and Treatment Gap for Depression in Children, Adolescents, and Youths.- Chapter 3. Preventing Depression in Children and Adolescents Through Mindfulness-Based Interventions in Schools.- Chapter 4. Digital Technology Interventions for Preventing and Treating Youth Depression.- Chapter 5. Contemplation of Nature to Promote Mental Health and Prevent Depression in Youth.- Chapter 6. Internet-Based Interventions for Prevention and Early Treatment of Depression in Higher Education Students.- Part II. Adults and Older Adults.- Chapter 7. Interventions for Adult Depression in Primary Health Care Clinics.- Chapter 8. The Potential of Internet-based Psychological Interventions for Perinatal Depression Prevention and Treatment.- Chapter 9. Preventive and Early Treatment of Depression in Older Adults.- Chapter 10. Depressive Disorders Among Family Caregivers of People Living with Dementia.

Vania Martínez is Associate Professor at the Faculty of Medicine of Universidad de Chile. She is a child and adolescent psychiatrist graduated from Universidad de Chile with a PhD in psychotherapy from Pontificia Universidad Católica de Chile. She is currently the Director of the Millennium Nucleus to Improve the Mental Health of Adolescents and Youths (Imhay) and Associate Researcher at the Millennium Institute for Research in Depression and Personality (MIDAP). Her main research lines focus on depression, suicidality, and digital mental health interventions for adolescents and young people.Claudia Miranda is Associate Professor at the Faculty of Nursing of Universidad Andrés Bello, Chile. She is a psychologist graduated from Universidad de Tarapacá, Chile, with a PhD in mental health and aging from the University College London, UK). She is currently the Director of the Millennium Institute for Caregiving Research (MICARE) and Associate Researcher at the Millennium Institute for Research in Depression and Personality (MIDAP). Her main research lines focus on the assessment and improvement of psychosocial aspects in older people and also on the implementation and evaluation of psychosocial interventions for people with dementia and their family caregivers.

• Chapter 1. Introduction.- Part I. Children, Adolescents, and Youths.- Chapter 2. Innovations in Closing the Global Prevention and Treatment Gap for Depression in Children, Adolescents, and Youths.- Chapter 3. Preventing Depression in Children and Adolescents Through Mindfulness-Based Interventions in Schools.- Chapter 4. Digital Technology Interventions for Preventing and Treating Youth Depression.- Chapter 5. Contemplation of Nature to Promote Mental Health and Prevent Depression in Youth.- Chapter 6. Internet-Based Interventions for Prevention and Early Treatment of Depression in Higher Education Students.- Part II. Adults and Older Adults.- Chapter 7. Interventions for Adult Depression in Primary Health Care Clinics.- Chapter 8. The Potential of Internet-based Psychological Interventions for Perinatal Depression Prevention and Treatment.- Chapter 9. Preventive and Early Treatment of Depression in Older Adults.- Chapter 10. Depressive Disorders Among Family Caregivers of People Living with Dementia.