Doni started his career with PT. Medco E&P Indonesia in 1997 after graduated from Civil Engineering Department, University of Indonesia. His first assignment was to develop Environment Impact Analysis study for Medco E&P Indonesia’s Kaji oilfield which was the biggest oilfield discoveries in the last decade at that time. This assignment was followed by various assignments not only in the field of environment but also in occupational health and safety. Doni was promoted as Manager of Environment in 2003 and then as Manager of Safety and Occupational Health in 2005. One of his achievements during that period was the establishment of Medco E&P Indonesia HSE Management system that was called PRIME (Performance Requirement of the Integrity of MedcoEnergi). In 2010, Doni was transferred to field operation and assigned as Manager of Health, Safety and Environment in Rimau asset, the biggest oil producer asset of Medco E&P Indonesia. During this assignment, Doni succeeded in implementing various excellent environment initiatives and brought Medco E&P Indonesia – Rimau Asset as the first and only oil and gas company in Indonesia awarded with the GOLD PROPER in 2011. GOLD PROPER is the highest environment award from the Ministry of Environment, Republic of Indonesia as a result of a comprehensive annual environment audit by the Ministry of Environment. Medco E&P Indonesia – Rimau Asset has successfully sustained this GOLD PROPER Award until now