William K. O'Brien

Mr. O’Brien served as Executive Chairman at Enterasys Networks from 2003 until his retirement in 2006. He served as Chief Executive Officer of Enterasys from 2002 to 2004. Prior to working at Enterasys, he worked for 33 years at PricewaterhouseCoopers where he held several different senior management positions in auditing and professional services including serving as global managing partner of PwC. Mr. O’Brien joined the Mercury Board in 2008.