In Opinion: Communities Must Take the Lead in Preventing Opioid Overdoses, Dr. Nabila El-Bassel shares the successes of the HEALing Communities Study, a five-year study about reducing overdose deaths that was that largest community-based addiction research study ever conducted. Using an integrated approach, engaging with the community as experts in their own needs, and prioritizing data access, many of the study's 67 communities were able to build robust coalitions to work toward the study's goals and keep those coalitions in place after the study ended.