Energy infrastructure company Williams has named John Dearborn as senior vice president of NGL & Petchem Services. Dearborn will oversee Williams' and Williams Partners' natural gas liquids and olefins business and operations.

Independent research firm IHS Herold Inc. has provided OGFJ with updated production data for our periodic ranking of US-based private E&P companies. The rankings are based on operated production only within the United States.

J. P. Morgan reports that Vean Gregg, who has played an important role in building the firm’s oil and gas business, will take a “sabbatical” from the firm, beginning in June.

Oklahoma City-based SandRidge Energy Inc. (NYSE: SD) has appointed David C. Lawler as COO.

Lucas Energy Inc. (NYSE MKT:LEI), an independent oil and gas company with main operations in Texas, has appointed William J. Dale as CFO, treasurer, and secretary of the company.

Larry Hornbrook, CFO of Aztec Oil & Gas Inc. (OTCPink: AZGS), will retire effective April 30, 2013.

Effective April 1, 2013, Vince Ghazar has been appointed as the new CFO and vice president of finance for Calgary, Alberta junior public oil and gas company Standard Exploration Ltd.

Jan Kees van Gaalen will become executive vice president and CFO of Dresser-Rand, effective May 1, 2013, Dresser-Rand Group Inc. (NYSE: DRC) announced Wednesday.

Andrea J. Chambers, who advises energy industry clients nationwide on policy, regulatory, and compliance matters and represents them before the FERC, has joined Ballard Spahr’s Washington, D.C., office as a partner in the Energy and Project Finance Group.