Southwestern Energy Co. (SWN) CFO R. Craig Owen has resigned to take the same position at Rosehill Resources. SWN is focused on the Appalachian Basin and Fayetteville Shale, while Rosehill operates in the Permian Basin’s Delaware sub-basin. Owen has worked for SWN nearly nine years and has been CFO since 2012. Owen will remain in his position to assist with a transition through late June. SWN Senior Vice President Jennifer Stewart of tax and treasury has been named acting financial chief; she joined SWN in 2010. Owen’s departure comes after SWN spent much of 2016 in a defensive position weathering the commodities downturn; it’s since been ramping back up.

Tony C. Maranto, COO of Continental Resources Inc. since May 1, resigned effective June 5 and his duties have been absorbed by the management team, according to a Securities and Exchange Commission (SEC) Form 8-K filing. Maranto, 57, previously worked for EnerVest Operating Co., where he had served as an executive vice president/COO since August 2016. From March 2004 to July 2016 Maranto was vice president/general manager at EOG Resources Inc., where he ran the Midcontinent business unit. Maranto’s base salary at Continental was $525,000/year. According to the April SEC filing, Maranto’s son is employed by Continental as an engineer.

Halliburton Co.has appointed Parker Drilling Co. CFO Christopher Weber as financial chief effective June 22. Weber, who has been Parker CFO for four years, previously was vice president/treasurer of Ensco plc, which he joined following its takeover of Pride International. Weber also previously worked with The Boston Consulting Group. He has a masters degree from the Wharton School at the University of Pennsylvania and an undergraduate degree from Vanderbilt University. Halliburton’s former CFO Mark A. McCollum in April became CEO of Weatherford International plc. Parker Drilling has appointed Jon-Al Duplantier as interim CFO; he is senior vice president, chief administrative officer and general counsel.

Williamshas appointed Chad Zamarin senior vice president of corporate strategic development effective June 26 to succeed Frank Billings, who is retiring. Zamarin would oversee business development, customer relationships and be responsible for government affairs and project analysis. He formerly was president of pipeline and midstream at Cheniere Energy Inc. and also previously worked for a NiSource Inc. affiliate.