Rajiv L. Gupta served as Lead Independent Director of the Board from November 2015 to March 2017 and from November 2011 to April 2013. Mr. Gupta has served as Chairman of Avantor Performance Materials, a manufacturer of chemistries and materials, since August 2011, and as Senior Advisor to New Mountain Capital, LLC, a private equity firm, since July 2009. Previously, Mr. Gupta served as Chairman and Chief Executive Officer of Rohm and Haas Company, a worldwide producer of specialty materials, from 1999 to April 2009. Mr. Gupta had previously held various other positions at Rohm and Haas, which he joined in 1971, including serving as Vice Chairman from 1998 to 1999, Director of the Electronic Materials business from 1996 to 1999, and Vice President and Regional Director of the Asia Pacific Region from 1993 to 1998. Mr. Gupta is also a director of Delphi Automotive PLC, The Vanguard Group, and several private companies.