Established in 1986, the Lighthouse Institute (LI) is the research division of Chestnut Health Systems, a not-for-profit 501c3 company. LI staff conduct investigator-initiated health services and implementation research. Much of LI research focuses on prevention, treatment and recovery, and program evaluation for our community partners. Lighthouse operates multiple training centers for evidence-based practices delivered in clinical practice agencies across the US, Canadian Provinces, and internationally.

LI has over 110 employees and operates out of 3 main offices: Bloomington, IL; Chicago, IL; Eugene, OR with remote staff in 23 states around the US. LI is known for collaborating with other researchers and community organizations, strong implementation, high recruitment and follow-up rates, use of service cascades, clinical decision support, longitudinal intervention/analysis, advanced measurement/analytic methods, incorporating community level data, and commitment to publication/dissemination to the field. LI is proud to include and learn from multiple scientists and staff with lived experience with substance use disorders and legal/welfare systems involvement.