KJ Seung is a co-Leader of the endTB project and a Principal Investigator (PI) of the Observational Study. 

Dr. Seung joined PIH in 2001, after it was awarded a Gates Foundation grant to develop a scalable model for MDR-TB treatment. Dr. Seung worked closely with the Peruvian Ministry of Health to care for patients with MDR-TB, and to develop clinical protocols that eventually laid the foundation for WHO normative guidelines. 

In 2007, Dr. Seung began working in Lesotho as part of PIH's effort to combat the dual epidemics of MDR-TB and HIV, and developed the first community-based MDR-TB program in Africa. Since 2009, he has been active in North Korea, working with the Eugene Bell Foundation to introduce MDR-TB diagnosis and treatment.