Mark Lashier
Chairman and Chief Executive Officer
2022 – Present
4 years (current)
Key Decisions & Impact
Lashier began his career as a research engineer at Phillips Petroleum 33 years before becoming CEO, and served as CEO of Chevron Phillips Chemical Company (CPChem), the 50-50 joint venture half-owned by Phillips 66, before returning to Phillips 66 as COO in April 2021 and becoming CEO in July 2022. Since taking over he has navigated a public activist campaign from Elliott Management, which pushed unsuccessfully for a full Midstream spin-off in a contested 2025 proxy fight that Elliott partially won, gaining two board seats.
Legacy
Under Lashier, Phillips 66 completed full ownership of DCP Midstream ($3.8 billion, 2023) and Cenovus's remaining WRB Refining interest ($1.4 billion, 2025), consolidating rather than breaking up the portfolio Elliott targeted, while FY2025 revenue fell to $132.376 billion amid weaker refining margins. His research-engineer-to-CEO career path is unusual in an industry where finance and commercial backgrounds more commonly lead to the top job, and he has credited that technical grounding with giving him direct credibility on refining and chemicals operating decisions that a purely commercial executive might lack.