The Horizon Center is affiliated with the following community groups:

The Roxbury Community Research Advisory Board (CRAB): The Roxbury CRAB consists of community leaders and residents whose goal is to improve community understanding of and responsiveness to community-based and clinical research.

The Cherishing Our Hearts and Souls Coalition (COHS) The COHS coalition is a racially and ethnically diverse group of residents and health professionals who joined together to improve the health of a culturally and geographically defined community: African Americans living in inner Boston neighborhoods.