Chevron Phillips Chemical Co. announced President and CEO Peter Cella intends to retire effective Aug. 1, and will be succeeded by Mark Lashier, currently executive vice president for commercial. The company also announced several additional management changes effective July 1: Senior Vice President for Manufacturing Scott Sharp will become executive vice president for manufacturing; Senior Vice President for Projects and Supply Chain Ron Corn will become senior vice president for petrochemicals, with responsibility for olefins, natural gas liquids and aromatics product lines; Polymers Vice President Dave Morgan will become senior vice president for polymers and specialties; Petrochemicals Vice President Dave Smith will assume a new role as senior vice president for corporate planning and technology; Specialties Vice President Jim Becker will become polymers vice president; and Corporate Planning and Development Vice President Jim Telljohann will assume a commercial role as specialties vice president, reporting to Dave Morgan.