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During the course of her career, Ms. Carnes has served in various senior roles at Pricewaterhouse Coopers, or PwC (an international accounting firm), including as: (i) Assurance Partner serving large, publicly traded companies in the energy industry; (ii) Managing Partner of PwC's Houston, Texas office; and (iii) PwC's Energy and Mining leader for the United States, where she led the firm's energy and mining assurance, tax and advisory practices. She currently serves as a director on the Supervisory Board of Core Laboratories N.V., a Netherlands company (one of the world's largest providers of reservoir description and production enhancement services to the oil and gas industry), where she is Chairman of the Audit Committee. She is also a director of Matrix Service Company (a provider of design, engineering, construction, repair and maintenance services to industrial and energy clients in North America), where she Chairs the Audit Committee and serves on the Compensation, and Nominating and Corporate Governance committees.