THE WOODLANDS, Texas — Chevron Phillips Chemical Co. LLC recently made a number of management changes. Rick Roberts, senior vice president of Manufacturing, has elected to retire after 37 years of distinguished service with Chevron Phillips Chemical and Chevron. In light of Roberts’ retirement, the following changes will be effective Dec. 1. Dan Coombs will become senior vice president, Manufacturing. Ron Corn will become senior vice president, Specialties, Aromatics & Styrenics. Jim Telljohann will become vice president, Corporate Planning & Development. Effective Feb. 1, Mike Zeglin will become vice president, Qatar and Jim Becker will become executive president, Saudi Polymers Co. Effective Jan. 1, Bob Rhoades will become Asia/Pacific Region general manager. Effective Feb. 15, Scott Sharp will become senior vice president, Projects. For more information, visit www.cpchem.com or call (800) 231-1212.