The generational change at the top of Glencore Plc gained speed on Monday, after the company announced the retirement of its long standing head of oil Alex Beard. Beard, 51, was at one time seen as a possible successor to Glencore chief Ivan Glasenberg. He was all but ruled out for the job after Glasenberg said in December that the next leader will come from a younger generation. Beard will retire at the end of June. Known for his acumen trading Russian oil, the British executive became the head of oil at Glencore in 2007 and helped lead the company through its initial public offering nearl...