Sarah Mackin, MPH, is the director of AHOPE Needle Exchange at the Boston Public Health Commission, where she began her work in harm reduction and drug user health in 2010. She oversees the largest needle exchange and harm reduction program in New England, which provides comprehensive drug user health services to over 8,000 people each year. Mackin brings has over 15 years of experience in the fields of public health, substance use, harm reduction, HIV/AIDS, and homelessness.