Roger W. Cohen

7165 Fay Avenue

La Jolla, CA 92037

January 18, 2010 To Whom It May Concern: Jeff Lassle and I have been working together in a group of businessmen, scientists and politicians in California on activities aimed at educating the public on various matters of strong public concern. I have found Jeff to be extremely knowledgeable and sophisticated about a wide variety of economic and regulatory issues. He is clearly experienced in these matters and draws heavily from his significant experience in industry. He is energetic and articulate, having strong communication and persuasion skills that make him effective in a highly diverse group. Jeff has assumed a leadership role in coordinating and organizing a complex set of activities. I enjoy working with Jeff, and it is a pleasure to recommend him for a position of responsibility in your organization. Very truly yours,

Roger W. Cohen Manager, Strategic Planning and Programs Exxon Mobil Research and Engineering Company Exxon Mobil Corporation (retired)