More than any other theme, the articles in this special issue underscore the critical nature of strong telepsychology training as a growth opportunity for the field. Pierce, Perrin, and McDonald (2020) found in their path model that the strongest predictors of psychologists' use of telepsychology were subjective norms, perceived ease of use, and perceived usefulness of telepsychology. Put simply, psychologists who do not use telepsychology do not feel that others are using it or that it is easy to use or useful. For these nearly 80% of psychologists, this has to change, and the primary way to do it is through strong telepsychology training implemented for trainees both early and often in their training, as well as practicing psychologists at various phases of their careers. Indeed, lack of training was the most frequently endorsed barrier to telepsychology use among mental health care providers (Perry, Gold, & Shearer, 2020). Caver et al. (2020) describe some of the excellent telepsychology training programing offered by the U.S. Department of Veterans Affairs (VA) and the VA's strong efforts to overcome barriers to training and implementation. The VA is at the forefront of efforts to support telepsychology provision. Dissemination and implementation (D&I) science is sorely needed in this arena to determine what variables have facilitated the D&I of telepsychology and telemedicine within the VA and other technologically progressive health care systems, as well as to apply those findings to other systems and settings.