Brown, 56, will remain a member of Shell's executive committee until his departure on Sept. 30, Shell said in a statement. "I am grateful to Andy for his strong leadership of the Upstream business, particularly having improved business performance during the recent years of low oil prices," Chief Executive Officer Ben van Beurden said in a statement.
Shell, the second largest publicly-traded oil company behind Exxon Mobil, produced nearly 3.6 million barrels per day of oil and gas equivalent in the third quarter of 2018. Shell transformed its upstream operations following the $54 billion acquisition of smaller rival BG Group in 2016 that gave it a leading position in Brazil's rapidly growing deepwater production. Since then Shell has sold many oil and gas assets in order to focus on the most competitive fields in areas such as the North Sea and the Gulf of Mexico.