Michael W. Collier joined Willbros in 1995, marketing the Company's services to Latin American markets and to Houston-based international energy companies. In 2000, Mr. Collier was appointed Manager, Investor Relations, and continues to support corporate marketing, communication and business development activities. He was appointed Vice President of Investor Relations in January, 2006. He has over 30 years experience, both domestic and international, in the pipeline engineering, construction and maintenance industry. He received a Bachelor of Arts degree in Classics and Political Science from Tulane University and an MBA from Southern Methodist University.
		Gordon Hagendorf joined Willbros as Vice President of Human Resources in January 2008. He has a diversified background in strategic HR development, executive leadership training, and HR process and performance improvements, on both a domestic and international basis.  Mr. Hagendorf has over 30 years of extensive HR expertise working at Brown & Root and Aker Kvaerner in all phases of HR.  He worked in several HR management positions with Brown & Root over a 17-year career and served as Senior Vice President for Aker Kvaerner for all HR activities in the construction and process businesses in the U.S., Canada, and South America.  He also has extensive experience in Asia, the Middle East and Australia.  Mr. Hagendorf holds a Bachelor or Science degree in Criminal Justice from Sam Houston State University and several professional certifications in HR.
		Ronald A. Lefaive joined Willbros in 2003 as Corporate Controller responsible for all accounting functions at the corporate level. Mr. Lefaive served previously as Vice President of Finance and CFO for Seven Seas Petroleum. He has over 25 years of experience in the energy industry which includes working for such companies as Halliburton, Chesapeake Energy Corporation and Shell Oil Company. Mr. Lefaive is a C.P.A. with a B.B.A in Accounting from the University of Houston.
		Rafael Marrero joined Willbros in 2008 as Vice President of Global Procurement. Mr. Marrero has over 20 years of procurement, supply chain and contract experience working in both the government and corporate sectors.  He has held various management positions while working for companies as US West, Waste Management and Exelon.  Mr. Marrero is a graduate of the US Air Force Academy with a BS in Engineering and holds a MA in Acquisition and Procurement from Webster University.
		Richard “Rick” Russler joined Willbros in August 2005 as Director of Internal Audit with reporting responsibility to the Audit Committee of the Board of Directors and was recently appointed as Corporate Compliance Officer, overseeing regulatory compliance. He is a CPA with responsibility for the internal audit requirements for Willbros worldwide. Mr. Russler has over 20 years experience in internal audit services and Securities and Exchange Commission audits, operational accounting and controls, and in technology management and control issues. He previously worked 22 years with Arthur Anderson LLP where he served as a Partner for eight years. Mr. Russler holds a Bachelor’s degree in Economics from the University of Wisconsin and received a Masters degree in Accounting from the University of Wisconsin-Milwaukee.