The generational shift at the top of Glencore continues with the company announcing the retirement of Alex Beard, the long-serving head of its oil business. Mr Beard, who joined the miner and commodity trader in 1995, will leave the company at the end of the month. He will be replaced by Alex Sanna, who will take a new title as head of oil marketing. The departure of Mr Beard comes as Glencore deals with the fallout of a US Department of Justice probe of its activities in the Democratic Republic of Congo, Venezuela and Nigeria. It also follows the retirement of Chris Mahoney, the veteran he...