James M. Trimble was president and CEO of PDC Energy (NASDAQ: PDCE) from 2011 to 2015.
Welch most recently served as executive vice president and CFO of JP Energy Partners from November 2013 through its recent merger with American Midstream Partners.
Stephen Chazen, former president of Occidental, will lead a new company that hopes to raise more than $600 million for shale gas acquisitions.
Most recently, Jeff Ritenour was senior vice president of corporate finance, investor relations and treasurer. Devon also said that its incumbent CFO, Tom Mitchell, will leave to pursue other interests.
Shahid A. Ghauri joined the company in March. Previously, he was a partner with Jones Walker, handling oil and gas business and commercial transactions.
Prior to joining VAALCO, Phil Patman Jr. was senior vice president of business development for the Americas at Thailand’s PTTEP from 2012 to 2016.
Brooks has more than 34 years of experience in the energy industry, most recently as CEO for Yates Petroleum which merged with EOG Resources in October.
Jack Stark's title is set to change to president when Maranto joins May 1. Stark has served as president and COO of Continental since 2014 and has been with the company since 1992.
Painter, whose resignation is effective April 30, had only held his current position since January. He previously served as Cobalt's executive vice president of the Gulf of Mexico from the company's inception in 2005.
Compensation for three of Chevron Corp.'s senior leaders, including CEO John Watson, rose last year due to a change in how the value of pensions are calculated.