JACC's February 24 issue highlights the ACC/AHA ACHD guideline. In this in-depth interview, JACC Executive Associate Editor Emily Bucholz, MD, PhD, MPH, speaks with JACC Associate Editor Anne Marie Valente, MD, FACC, on her piece co-written with Carole A. Warnes, MD, FACC. In the interview and viewpoint, they discuss key updates in the adult congenital heart disease guidelines, emphasizing expanded evidence, stronger collaboration between ACHD specialists and general cardiologists, and the need for lifelong, multidisciplinary care. What is in store for multicenter research, genetics, and emerging technologies, and how will they shape ACHD care over the next decade?