Former Nabors Industries Ltd. Chairman and CEO Eugene Isenberg has died. He led the board of directors and served as CEO from 1987 until 2011, taking the drilling operator from bankruptcy to a place on the S&P 500 with an enterprise value of more than $9 billion. Current CEO Anthony G. Petrollo said Isenberg had been a "pioneer for Nabors in many ways," steering the company "from a minor player to the largest land driller in the world, a feat more remarkable since it was accomplished during one of the most challenging periods in the inherently cyclical drilling industry." Isenberg graduated from the University of Massachusetts and received a master's degree from Princeton University. He began his career at predecessor Exxon Corp. in 1952, then helmed a steel building products company before joining Nabors in 1987, which at that time was based in Alaska with 320 employees.