John McCartney was appointed Non-executive Chairman of the board in May 2010. He has served on our board since October 2004. From that date until February 2010, he served as chairman of the Audit Committee. In July 2007, Mr. McCartney was appointed a non-executive director of Datatec Limited, a networking technology and services company, where he serves as chairman of the remuneration committee and also serves on the nominating committee. He had previously served as vice chairman of the board of directors of Datatec from October 1998 until May 2004. In August 2011, Mr. McCartney joined the board of Transco, Inc., a Chicago-based company that provides solutions to customers in the railroad, electric utility, process and manufacturing industries. From March 2011 until September 2013, Mr. McCartney served as chairman of the board of Westcon Group, Inc., a specialty distributor of networking and communications equipment, whose board he joined in August 1998 and for which he previously served as chairman from January 2001 until March 2009, and continued to serve as a director until September 2017. Mr. McCartney had previously served as chairman of the board of directors of A.M. Castle & Co., a global distributor of specialty metal and plastic products, from January 2007 until April 2010. He had served on that board from 1998 until March 2015. Mr. McCartney served on the board of Rice Energy Inc., an independent natural gas and oil company, from March 2015 until November 2017. From May 2009 until February 2015, he served on the board of Covance Inc., a drug development services company. From June 1997 to March 1998, Mr. McCartney held the position of president of 3Com Corporation's Client Access Unit. He joined the executive management team of US Robotics in March 1984 as vice president and chief financial officer and served in various executive capacities until serving as president and chief operating officer of US Robotics from January 1996 until its merger with 3Com Corporation in June 1997. Mr. McCartney received a B.A. in Philosophy from Davidson College and an MBA from The Wharton School of the University of Pennsylvania.