Instructions: In this task you are given data in the tabular format and a question. Write the answer to the question based on the information in the table.
Input: Table: ['Class', 'Name', 'Company', 'Residence', 'Term Expires Dec 31', 'Notes']. ['A', 'Max T. Wake', 'Jones National Bank & Trust Co.', 'Seward, Nebraska', '2013', '']. ['A', 'Vacancy', '', '', '2014', '']. ['A', 'David W. Brownback', 'Citizens State Bank & Trust Company', 'Ellsworth, Kansas', '2015', '']. ['B', 'Vacancy', '', '', '2013', '']. ['B', 'Richard K. Ratcliffe', "Ratcliffe's Inc.", 'Weatherford, Oklahoma', '2014', '']. ['B', 'John T. Stout, Jr.', 'Plaza Belmont Management Group LLC', 'Shawnee Mission, Kansas', '2015', '']. ['C', 'Rose Washington', 'OTulsa Economic Development Corporation', 'Tulsa, Oklahoma', '2013', '']. ['C', 'Barbara Mowry', 'GoreCreek Advisors', 'Greenwood Village, Colorado', '2014', 'Chairman']. ['C', 'Steve Maestas', 'NAI Maestas and Ward', 'Albuquerque, New Mexico', '2015', 'Deputy Chairman']. Question: who served as the chairman?
Output:
Max T. Wake, Vacancy, David W. Brownback, Vacancy, Richard K. Ratcliffe, John T. Stout, Jr., Rose Washington, Barbara Mowry, Steve Maestas