Exxon Mobil said on Tuesday that Dan Ammann, former president of General Motors , will take over its largest and most profitable business early next year.

Exxon Mobil (NYSE:XOM) said Tuesday that Liam Mallon, the head of its E&P business, will retire effective February 1 after 34 years with the company, to be succeeded by Dan Ammann. Mallon has been president of Exxon Mobil Upstream (XOM) since 2022 after holding several leadership roles in Africa,

The head of Exxon Mobil’s massive exploration and production arm is retiring after more than three decades with the energy giant and will be replaced by a former General Motors executive.

Spring-based Exxon Mobil Corp. (NYSE: XOM) has named two new presidents in the wake of a major retirement announcement. Liam Mallon, president of ExxonMobil Upstream Co. and vice president at Exxon, will retire Feb.