Sarun left Cambodia for the Thai-Cambodian border in the early eighties where he became a medical assistant and worked for several years for the American Refugee Committee (ARC) and managed the ARC Hospital at Site II. Upon repatriation to Cambodia, he worked as a manager or the World Food Program, in Siem Riep where he was a monitoring and evaluation specialist. Sarun joined the CHC in 2006, as the manager and coordinator of the pulmonary ward.

An was born in Svay Rieng Province and is a long time member of CHC, working as a TB home care nurse in Svay Rieng. He has revcently relocated to Phnom Penh where he is working on the KFSH pulmonary ward.

Based at the AKS pulmonary ward, Chhoun works as a nurse and Social Worker with a focus on HIV-1 patients.