Effective May 18, 2017, NL Industries, Inc.'s board of directors elected Courtney J. Riley as the company's president. Ms. Riley was formerly the company's executive vice president, environmental affairs and general counsel. Robert D. Graham was formerly the company's president, and Mr. Graham continues to serve as the company's chief executive officer. Courtney J. Riley, served as the company's executive vice president, environmental affairs and general counsel from January 2017 to May 2017, as the company's vice president, environmental affairs and general counsel from May 2016 to January 2017, and as the registrant's vice president, environmental affairs from 2012 to January 2017. She currently serves as vice president, environmental affairs of Kronos Worldwide, Inc., as executive vice president, environmental affairs of Valhi, Inc.