Occidental Petroleum is focused on growing, with the help of Warren Buffett, as it looks to compete with the industry's largest players. The name Occidental Petroleum (OXY -1.38%) gets more attention than it used to, thanks to the involvement of Warren Buffett and Berkshire Hathaway (BRK.A -0.15%) (BRK.B -0.11%), the company Buffett runs. Given the Oracle of Omaha's fame as an investor, some might buy Occidental Petroleum for this fact alone. But you'll probably want to get a bit more of an understanding he ...