Houston-based Occidental Petroleum Corp. (Oxy) board of directors on Friday named Vicki Hollub CEO of the company as was previously announced as part of the exploration/production company’s succession plan (see Daily GPI, Dec. 10, 2015). Named a director on the board in December, the 35-year Oxy veteran Hollub succeeds Stephen Chazen, who stepped down as CEO at Oxy’s annual shareholder meeting. Hollub had been named president/COO last year and the successor to Chazen when he retired.