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Committee Composition
Below is a summary of our committee structure and membership information. To read more about any of the committees, click on committee names in the chart below.
Chairperson Chairperson Committee Member Member Financial Expert Financial Expert
 Audit CommitteeCompensation & Development CommitteeGovernance & Nominating Committee
Gerald G. Ermentrout 
Gerald G. Ermentrout
Lead Director


Gerald G. Ermentrout has served as a director of the Company since June 2008. He joined Air Products and Chemicals, Inc. in 1975 and held various positions until his retirement in early 2007. From 1996 to 2007, Mr. Ermentrout served as the Vice President and General Manager of the Electronic Chemicals Division, which included the High-Purity Process Chemicals (“HPPC”) business. During his tenure at Air Products, Mr. Ermentrout held various positions in managing global materials and equipment bus... 
  Committee Member Chairperson
George W. Gilman 
George W. Gilman
Board Member


George W. Gilman has served as a director of the Company since its acquisition of KMG in October 1996 and also served as a director of KMG from 1995 until 1997. Mr. Gilman has served as the Chief Executive Officer, President and as a director of Commerce Securities Corporation, a National Association of Securities Dealers, Inc. member firm, since 1982. He practiced law with the law firm of George Gilman, P.C. from 1986 to 1998 and since 1998 has practiced with the law firm of Gilman & Wirth, P.C... 
Committee Member   Committee Member
Robert Harrer 
Robert Harrer
Board Member


Mr. Harrer joined KMG’s Board of Directors in September 2015. Most recently, Mr. Harrer was Senior Vice President, Chief Financial Officer of Innophos, a leading producer of performance-critical specialty grade phosphate products and nutritional specialty ingredients. From 2010-2013, Mr. Harrer was Executive Vice President, Chief Financial Officer and Chief Administrative Officer of Avantor Performance Materials, a global manufacturer of performance materials and chemicals for leading-edge elect... 
Committee Member Committee Member  
John  C. Hunter, III 
John  C. Hunter, III
Board Member


John C. Hunter III has over 40 years of global chemical industry experience. He began his career in 1969 with Monsanto Company, and for the next three decades held positions of increasing responsibility in areas such as engineering, sales, and management. He was appointed Vice President and General Manager, Asia Pacific, for the Specialty Chemicals Division of Monsanto Chemical Company in 1989, and Vice President and General Manager, Fibers Division and Asia-Pacific for the Chemicals Group, an o... 
  Committee Member Committee Member
Fred  C. Leonard III 
Fred  C. Leonard III
Board Member


Fred C. Leonard III has served as a director of the Company since 1996. From 1992 until 1997, Mr. Leonard served as a director of KMG’s subsidiary, KMG-Bernuth, and served as the Secretary of KMG-Bernuth from 1993 until 2001. From 1972 through April 2015, Mr. Leonard served as Chair of the Board, Chief Executive Officer and President of Valves Incorporated of Texas, Inc., a manufacturing company located in Houston, Texas. Mr. Leonard also currently serves as a board member of Integrity Bank, SSB... 
Committee Member Chairperson  
Karen A. Twitchell 
Karen A. Twitchell
Board Member


Karen A. Twitchell has served as a director of the Company since February 2010. Ms. Twitchell retired in 2009 as Vice President and Treasurer of LyondellBasell Industries, a worldwide chemical and refining company, and Lyondell Chemical Company (a predecessor by merger to LyondellBasell). Prior to joining Lyondell, Ms. Twitchell served as Vice President and Treasurer of Kaiser Aluminum Corporation and of Southdown Inc., and was also an investment banker with Credit Suisse First Boston in its cor... 
Chairperson   Committee Member