Halliburton Co. CFO Mark McCollum has been tapped to lead Weatherford International plc as president and CEO beginning in April. First Reserve Co-CEO William Macaulay was appointed chairman of the board. Halliburton General Counsel Robb L. Voyles has been named the company’s interim CFO. McCollum became Halliburton’s financial chief in 2008, but he stepped aside briefly in 2015 to become chief integration officer during the failed takeover bid of Baker Hughes Inc. “I am excited to join the company at such an important time,” McCollum said. “I look forward to working with the team to build a stronger and healthier Weatherford with a clear purpose and vision for the future.” Weatherford has cut its ties with interim CEO and former CFO Krishna Shivram, who was widely praised after assuming leadership when Bernard J. Duroc-Danner retired in November. Until McCollum comes aboard, Weatherford CFO Christoph Bausch will serve as acting CEO. “I would like to take this opportunity to thank Krishna for his contributions to the company and his years of service at Weatherford,” Macaulay said. “Krishna was instrumental in helping us through this transition process while setting the company on the right path forward. The entire Weatherford family wishes him well in his future endeavors.”