HOUSTON — Fresh off a number of major asset sales, Houston-based exploration and production firm Apache Corp. is shuffling its executive ranks effective Jan. 1. Rod Eichler, president and COO, will become executive advisor to the chairman of Apache and CEO of Kitimat, where he will focus on oversight of Apache’s liquefied natural gas business and take on other duties. John Christmann, region vice president for the Permian, will become executive vice president and chief operating officer, North America. Tom Voytovich, executive vice president for international operations, will become executive vice president and COO, international. For more information, visit www.apachecorp.com or call (800) 272-2434.