San Diego-based Sempra Energy has named Carlos Ruiz Sacristan, 68, as CEO of a newly formed North American infrastructure business. He has run Sempra’s Infraestructura Energetica Nova SAB de CV (IEnova) since 2012. The North American business will include Mexico-based IEnova, Sempra LNG & Midstream and all other liquefied natural gas (LNG) development and marketing activities. Tania Ortiz Mena, 48, was named IEnova CEO as of Sept. 1.

Contango Oil & Gas Co. President and CEO Allan D. Keel, who has run the Gulf of Mexico shallow water explorer since it merged with Crimson Exploration Inc. in 2013, has resigned to “pursue other business interests.” Wilkie S. Colyer Jr., who was appointed to the board with private investor John C. Goff, was named interim president and CEO. Goff, 62, who recently acquired an 18.3% stake in Contango, is based in Fort Worth, TX, where he co-founded and is chairman of privately held Crescent Real Estate Holdings. Colyer, 33, joined Goff Capital, the family office of John Goff, in 2007 and most recently served as principal for Goff Capital Inc. and senior vice president of Investments of Goff Focused Strategies LLC. Colyer has been responsible for energy investing and serves on the board of publicly held Resolute Energy Corp. and Mid-Con Energy Partners LP, both of which Goff has stakes in.