Halliburton Co. (NYSE: HAL) shifted responsibilities in its C-suite on March 6 in response to the departure of its CFO, Mark McCollum, who was named CEO of Weatherford International Plc (NYSE: WFT).

Robb L. Voyles, the company’s executive vice president and general counsel, takes over as interim CFO until a replacement is found. Halliburton also promoted Lyn Beaty to senior vice president of finance.

“We are pleased that Robb has agreed to serve as interim CFO during this important time and believe Lyn’s well-deserved promotion will provide additional leadership to the finance organization and ensure a seamless transition as we secure a new CFO,” said Chairman and CEO Dave Lesar. “On behalf of the Halliburton Board of Directors and our management team, we thank Mark for his financial leadership and contributions to Halliburton. We built a strong team under Mark that will continue driving our financial functions.”

Voyles joined Halliburton in 2013 from Baker Botts LLP, where he was a senior partner and chair of the litigation department, as well as a member of the executive committee. He earned his JD from the University of Michigan Law school and his bachelor of business administration in accounting from the University of Dayton

Beaty is a 30-year veteran of Halliburton who moves to her current position from her role as senior vice president of internal assurance services. She is a certified public accountant who earned her bachelor’s degree in accounting from the University of Texas at Austin.