Over the course of the last two decades, improved practices in child and adolescent mental healthcare have led to a decreased environment of stigma, which also led to an increased identification and treatment of mental health disorders in children and youth. However, the success gained in the field of child and adolescent psychiatry leads to a new challenge: transitioning from adolescent care to adult care. It has been known for some time that children, adult, and geriatric patients all have unique needs where it comes to mental healthcare, yet limited work has been done where it comes to the shifting of the lifespan. Where it comes to the child-adult transition-defined as those in their late teens and early/mid-20s-there can be multiple barriers in seeking mental healthcare. Apart from increasing childhood intervention, the problem is exacerbated by the changing social dynamics: more youths are attending college rather than diving straight into the workforce, but for various reasons these youths can be more dependent on their parents more than previous generations. Technology has improved the daily lives of many, but it has also created a new layer of complications in the mental health world. The quality and amount of access to care between those with a certain level of privilege and those who do not have this privilege is sharp, creating more complicating factors for people in this age range. Such societal change has unfolded so rapidly that training programs have not had an opportunity to catch up, which has created a crisis for care. Efforts to modernize the approach to this unique age group are still young, and so no resource exists for any clinicians at any phase in their career. This book aims to serve as the first concise guide to fill this gap.