Telemental health, or TMH, has become integral to nearly all aspects of behavioral health service, including research and delivery of treatment, assessment, psychoeducation, training, supervision, and consultation. TMH has removed significant barriers to care access for many underserved groups; however, it also means that the field overall must build its capacity to provide this capability. This book is for seasoned clinicians as well as new providers preparing to enter the mental and behavioral health care professions. It chapters provide a guide for increasing TMH competencies, which require keeping up-to-date with the scientific evidence base and having ongoing collegial discussion with informed leaders in the clinical, ethical, and legal realms. Readers will benefit from the research presented and from the description of practical steps they can take to ensure they are providing rewarding, safe, and high quality TMH care for their patients. Updates to this new edition include coverage of current best practices, evidence-based recommendations, and attention to nuanced refinements of t elemental health in the face of recent accelerated growth in the field, due in part to the COVID-19 pandemic.