Lewis is replacing long-serving CEO Samir Brikho who left unexpectedly in January. His main priority will be to reach the company's target to halve debt before June 2017 and to boost investor confidence.
The latest round of cuts will reduce the Houston-based oilfield equipment maker and service provider's staff in Norway to less than 2,000, down from almost 5,000 at the height of the oil industry's boom two years ago.
Charlotte Kula has more than 30 years of accounting and finance experience across multiple sectors of the oil and gas industry, including services, drilling and shipping, Sigma Cubed said in a news release.
The European Commission, which halted its investigation into the $35 billion deal last month while waiting for more details from the companies, will now decide by Aug. 11 whether to clear or veto the takeover.