The Hoffmann Lab is focused on reducing TB and HIV morbidity and mortality in the low and middle income settings through behavioral and implementation science approaches. Work has focused on understanding individual-level behavior towards linkage to care and continued care engagement for HIV and TB and using this knowledge to develop approaches to increase HIV testing, linkage to care, HIV viral load suppression, and retention in care. Other work has focused on health system strategies to improve service delivery and improve adherence to best practice to guidelines-based care. The group's research includes work on the general population, corrections inmates and ex-inmates, men at risk for HIV, and recently hospitalized individuals. Most of the research has been in South Africa and elsewhere in sub-Saharan Africa.