Ms. Priestly served as Chief Executive Officer of Turquoise Hill Resources Ltd., an international mining company focused on copper, gold, and coal in the Asia Pacific region, from May 2012 until her retirement in December 2014. She previously served as Chief Financial Officer of Rio Tinto Copper (a division of the Rio Tinto Group Rio Tinto plc and Rio Tinto Limited), a global metal and mining corporation, from 2008 until her appointment as Chief Executive Officer of Turquoise Hill Resources in 2012. From 2006 to 2008, she was Vice President, Finance, and Chief Financial Officer of Rio Tinto's Kennecott Utah Copper operations. Ms. Priestly served as Vice President, Risk Management, and General Auditor for Entergy Corporation, an integrated energy company engaged primarily in electric power production and retail distribution operations, from 2004 to 2006. Ms. Priestly began her career with global professional services firm Arthur Andersen, where she progressed from staff accountant to partner, holding various management and leadership positions, including serving on the global executive team as Global Managing Partner People. During her 24 years with Arthur Andersen, she provided tax, consulting, and M&A services to global companies across many industries, including energy, mining, manufacturing, and services.