B.A. in Business Admin., Korea Univ.; MSc in Accounting, Univ. of Illinois. 1987, Senior Accountant, Deloitte & Touche, New York; 1991, McKinsey & Co., Seoul; 1998, Corporate Planning and Overseas Business Dev., LG. Since 2000, with SK: Head, New Business Dev.; 2007, President and CEO, SK Int'l; 2008, President, Resources & Chemicals Business, SK Energy; 2009, President and CEO, SK Lubricants; 2010, President, Refining and Marketing Business, SK Energy; 2011, President, Growth and Globalization, SK Holdings; since 2013, current position; CEO, SK E&S. Member, AICPA.