Rankin entered the oil business working for an oilfield company in Post, Texas.
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From 1955 to 1967, he worked for Hunt Oil Company before joining geologists Jim Bob Moffett and Ken McWilliams to form McMoRan Oil Company and McMoRan Exploration Company.
Mack Brown | Ian Rankin | Mack Sennett | Connie Mack | Mack the Knife | Ted Mack | Robert Rankin | Kenny Rankin | Rankin | Mack Trucks | Mack Rhoades | Mack 10 | Mack | Lonnie Mack | Reinhold Mack | Mack Reynolds | Mack Harrell | Connie Mack (baseball) | Lee Mack | Connie Mack III | Alexander Rankin | Yusaf Mack | Robert "Mack" McCormick | Rankin Inlet | Mack Gordon | Ludwig Hirschfeld Mack | Andre Mack | Adam Rankin Alexander | Willard Mack | The Mack |