This HEAL FOA provides an opportunity for early career researchers or early career clinicians with foundational backgrounds in addiction to develop expertise in implementation science. Successful applicants would propose training in implementation science methods, and a research project that would apply these to at least one of the four priority domains of the HHS Overdose Prevention Strategy: primary prevention (including appropriate opioid prescribing), OUD treatment, harm reduction, and/or recovery support services. The overarching goal is to build a cadre of implementation researchers who can contribute to addressing the current overdose crisis, develop research careers that will impact the quality of addiction clinical practice generally, and become the next generation of implementation experts and mentors.