US energy giant ExxonMobil has appointed Dan Ammann as head of its upstream business. According to a statement by ExxonMobil, Ammann will succeed Liam Mallon, who will retire as president of ExxonMobil Upstream and vice president of ExxonMobil, effective February 1, 2025. Also, Ammann will continue as vice president of ExxonMobil to succeed Mallon. ExxonMobil’s…
