EnergyProxy advisor PIRC recommends vote against Chevron CEO Reuters 2 minute read Chevron Corp Vice Chairman Michael Wirth speaks at Gastech, the world's biggest expo for the gas industry, in Chiba, Japan April 4, 2017. REUTERS/Toru Hanai Governance advisor Pensions & Investment Research Consultants (PIRC) on Wednesday recommended shareholders of Chevron Corp (CVX.N) cast votes against Chief Executive Michael Wirth at the company's upcoming shareholder meeting. PIRC urged opposition to Wirth because of the company's combined board chairman and CEO roles. The No. 2 U.S. oil producer also faces several climate and governance proposals that London-based PIRC said it supports. Chevron did not immediately respond to a request for a comment.