The SEC said Berko tried to hide the scheme from the bank, whose compliance officers questioned how the deal was put together. He was working for the bank when negotiations started but resigned when Goldman Sachs pulled the plug on the deal after compliance officers alerted leaders over some irregularities. He was working for the bank when negotiations started but resigned when Goldman Sachs pulled the plug on the deal after compliance officers alerted leaders over some irregularities. The SEC said Berko tried to hide the scheme from the bank, whose compliance officers questioned how the deal was put together. Berko is now the managing director of the Tema Oil Refinery, Ghana’s sole crude refinery, where he was appointed in January.