Question: Which company that mines two key crop nutrients—phosphate and potash did James T. Prokopanko  serve as president and Chief Executive Officer of?

Context paragraphs:
Mike Lunsford: Mike Lunsford is the chief executive officer of SK Planet, Inc., the U.S. arm of SK Planet, Ltd., a Korean-based company.  He is the former executive vice president and interim chief executive officer of RealNetworks, the former chief executive officer of Rhapsody, a joint venture between RealNetworks and Viacom, and the former president and interim chief executive officer of Earthlink.  Before joining EarthLink, Lunsford worked as a consultant at Andersen Consulting (now Accenture) in Chicago and Scott, Madden & Associates, a management consulting firm in Raleigh, North Carolina.  He received an undergraduate degree and a Masters of Business Administration (MBA) from the University of North Carolina.

PotashCorp: The Potash Corporation of Saskatchewan, also known as PotashCorp, is a Canadian corporation based in Saskatoon, Saskatchewan.  The company is the world's largest potash producer and the third largest producer of nitrogen and phosphate, three primary crop nutrients used to produce fertilizer.  At the end of 2011, the company controlled twenty percent of the world's potash production capacity, two percent of nitrogen production capacity and five percent of phosphate supply.  The company is part-owner of Canpotex, which manages all potash exporting from Saskatchewan.  It also has a joint-venture with Sinochem named Sinofert.  In late 2013, it was 60%-owned by institutional shareholders.  In 2007, the CEO, William Doyle was by far the highest earning CEO in Canada, earning over $320 million.

Glen Post: Glen F. Post III (born October 4, 1952) is the chief executive officer and president of CenturyLink, an S&P 500 integrated communications service provider based out of Monroe, Louisiana.  He earned a bachelor's degree in accounting in 1974 at Louisiana Tech University and an MBA in 1976 at Louisiana Tech.  Post joined CenturyTel in 1976.  He was named vice president in 1982 and was promoted to senior vice president and treasurer in 1984.  He was appointed to the CenturyTel board of directors in 1985, and the following year he was promoted to senior vice president and chief financial officer.  In 1988 Post was named executive vice president and chief operating officer.  He became the president and chief operating officer of CenturyTel in 1990.  In 1992 Post was named vice chairman of the board, president, and chief executive officer.  In 2002 he was appointed chairman of the board and chief executive officer.  Since 2009 Post has served as chief executive officer and president of CenturyLink.  His honors include: Louisiana Tech College of Administration and Business Distinguished Alumni in 1991, Louisiana Tech University Tower Medallion Award in 1997 and DeGree Enterprises Lifetime Achievement Award in Business 2003.

Stephen P. MacMillan: Stephen P. MacMillan is the Chairman, President, and Chief Executive Officer, and Director of Hologic, a medical device and diagnostic manufacturer headquartered in Marlborough, Massachusetts.  He was previously the Chairman of the Board, President, and Chief Executive Officer of Stryker Corporation, a global medical device company, and has 24 years of healthcare industry operating experience.  He served as Chief Executive Officer of Stryker from January 2005 to February 2012 and served as its President from June 2003 to February 2012.  During his tenure at Stryker, MacMillan successfully led the company through a series of key strategic acquisitions, the launch of a number of products within the orthopedic implants and medical instrumentation businesses, and delivered strong operating performance, with revenue growing from $2.8 billion to $8.3 billion, between 2003 and 2011.  During his tenure, Stryker delivered stock price appreciation of more than 62%, compared to appreciation of the S&P 500 index of approximately 40%.  While MacMillan presided as CEO, Stryker was selected by FORTUNE, over multiple consecutive years, as one of the "World's Most Admired Companies" in the Medical Equipment Industry.

Bobby Mehta: Siddharth N. "Bobby" Mehta was former CEO and vice chairman of HSBC North America.  Mehta served as an Advisor of TransUnion since December 31, 2012.  Mehta serves as consultant of TransUnion.  He served the chief executive officer and president of TransUnion from August 2007 to December 31, 2012, and Transunion Financing Corp. until December 31, 2012.  From May 2007 to July 2007, he served as a consultant to the board of directors at TransUnion.  He served as the chief executive officer and president of TransUnion until December 31, 2012.  He served as the chief executive officer of TransUnion LLC.  He served as chairman of the board and chief executive officer of HSBC Finance Corporation from April 2005 to February 2007.  He served as chief executive officer and president of TransUnion LLC from 2007 to 2012.  From 1998 to 2007, he held a variety of positions with HSBC Finance Corporation and HSBC North America Holdings, Inc.  Mehta served as chief executive officer of HSBC North America until February 2007.  Mehta served as consultant of TransUnion since May 2007 until July 2007.  Mehta served as group managing director of HSBC Holdings PLC of HSBC Finance Corp. since April 30, 2005, and its unit chief executive officer since March 2005.  He served as the chief executive of HS BC North America Holdings Inc., of HSBC Finance Corp., from March 2005 to February 15, 2007.  He served as an executive chairman of HSBC Financial Corporation Limited since April 2005 and served as its chief executive officer from April 2005 to February 15, 2007.  He served as the chief executive officer of HSBC Bank USA, N.A. until February 2007.  He served as the chief executive officer of HSBC North America Holdings Inc. since March 2005.  He served as chairman and chief executive officer of HSBC Financial Corp., Ltd.  He oversaw HSBC's global credit card services, its North American consumer lending and mortgage services businesses and its first mortgage operation.  He was also responsible for corporate marketing, strategic planning and corporate development for HSBC North America Holdings Inc. and had responsibility for the strategic management of credit cards throughout the HSBC Group.  Mehta served as group executive of Credit Card Services, Auto Finance and Canada of Household International Inc., since July 2002.  He worked at MasterCard’s U.S. region board since March 2000.  Mehta joined Household International Inc., in 1998.  He served as senior vice president of The Boston Consulting Group in Los Angeles and co-leader of Boston Consulting Group Financial Services Practice in the United States.  Mehta served as a director of Global Board of MasterCard Incorporated since March 17, 2005.  He served as unit chairman of HSBC Holdings PLC and served as its board member since March 2005.  He served as vice chairman and director of HSBC Financial Corporation Limited., (Formerly Household International Inc.).  He has been a director of Avant Credit Corporation since December 18, 2014.  He has been an independent director of The Allstate Corporation since February 19, 2014.  He serves as a member of the advisory board at Core2 Group, Inc.  He has been non-executive independent director at Piramal Enterprises Ltd since April 1, 2013.  He serves on the boards of Datacard, Chicago Public Education Fund, University of Chicago Laboratory Schools, The Economic Club of Chicago, The Field Museum and Myelin Repair Foundation.  He serves as a director of TransUnion Corp. and TransUnion LLC.  He served as a director of MasterCard International Inc. (also known as MasterCard Worldwide) (formerly, MasterCard Inc.), since March 17, 2005.  He served as a director of HSBC Financial Corp.  Ltd.  He has been a director of TransUnion since April 2012.  Mehta serves on the board of international advisors for the Monterey, California, Institute of International Studies and is a member of the Financial Services Roundtable.  He also serves on the board of advisors for the Myelin Repair Foundation.  Mehta holds a Bachelor of Arts in economics from the London School of Economics and Masters of Business Administration from the University of Chicago.  He stepped down as head of the North American unit after the lender raised its forecast for bad loans in the U.S.  He is of Indian descent.

Jim Lentz: Jim Lentz is the chief executive officer for Toyota North America; president and chief operating officer of Toyota Motor North America, Inc. (TMA); and a senior managing officer of the parent company Toyota Motor Corporation (TMC) which is located in Japan.  In that role Lentz manages all of Toyota’s North American affiliate companies which include TMA, Toyota Motor Sales, U.S.A., Inc. (TMS), and Toyota Motor Engineering & Manufacturing, North America, Inc. (TEMA), which includes responsibilities for Toyota Motor Manufacturing Canada Inc. (TMMC), and oversight for Toyota Canada, Inc. (TCI).  Lentz also serves as the chairman of the North American Executive Committee.  This is composed of the top leaders from the affiliate companies.  Most recently Lentz was the president and chief executive officer of TMS and senior vice president of TMA and served in a global advisory capacity as the managing officer for TMC.  Before that he served as president and chief operating officer and executive vice president of TMS.  Lentz previously held several executive positions including Toyota division group vice president and general manager where he oversaw all sales, logistics and marketing activities for Toyota and Scion regional sales offices and distributors.  He also served as the group vice president of marketing for the Toyota division and vice president of Scion, and was responsible for the initial launch of a new line of vehicles.  Lentz spent several years in the field as vice president and general manager of the Los Angeles region and before that general manager of the San Francisco region.  Prior to his role as general manager Lentz was vice president of marketing services for CAT in Maryland.  He has also held several other TMS positions, including field training manager, sales administration manager and truck sales team member.  Lentz joined Toyota in 1982 as the merchandising manager for its Portland, Oregon region where he later became the distribution manager and field operations manager.  He serves as chairman on the board of directors of The Global Automakers and is also a member of the executive advisory board for Daniels College of Business at the University of Denver (DU), his alma mater.  He was named “Marketer of the Year” by Advertising Age in 2006, an Automotive News “All Star” in 2007 and honored at Industry Leader of the year.

The Mosaic Company: The Mosaic Company is a Fortune 500 company based in Plymouth, Minnesota, a Minneapolis suburb.  Mosaic mines two key crop nutrients—phosphate and potash—and produces specialty products MicroEssentials, K-Mag and Pegasus.  It is the largest U.S. producer of potash and phosphate fertilizer.

B. Wayne Hughes: Bradley Wayne Hughes (born September 28, 1933) is the founder and chairman of Public Storage, the largest self-storage company in America doing business as a REIT or real estate investment trust.  As of 2014, Hughes is worth $2.2 billion.  Known all his life by his middle name, B. Wayne Hughes was the company's President and Co-Chief Executive Officer from 1980 until November 1991 when he became Chairman of the Board and sole Chief Executive Officer.  He retired as Chief Executive Officer in November 2002 and remains Chairman of the Board.  He was Chairman of the Board and Chief Executive Officer from 1990 until March 1998 of Public Storage Properties XI, Inc., which was renamed PS Business Parks, Inc. ("PSB"), an affiliated REIT.  From 1989-90 until the respective dates of merger, he was Chairman of the Board and Chief Executive Officer of 18 affiliated REITs that were merged into the Company between September 1994 and May 1998 (collectively, the "Merged Public Storage REITs").  has been active in the real estate investment field for over 30 years.

James T. Prokopanko: James T. Prokopanko is the former president and Chief Executive Officer of The Mosaic Company and has served in that capacity from January 1, 2007 to August, 2015.  He was a director of the company since October 2004.

Jonathan G. Ornstein: Jonathan Ornstein is Chairman and Chief Executive Officer of Mesa Air Group, Inc., and was appointed effective May 1, 1998.  From April 1996 to his joining the company as Chief Executive Officer, Ornstein served as President and Chief Executive Officer and Chairman of Virgin Express, a European airline.  From 1995 to April 1996, Ornstein served as Chief Executive Officer of Virgin Express Holdings, Inc.  Ornstein joined Continental Express as President and Chief Executive Officer in July 1994 and, in November 1994, was named Senior Vice President, Airport Services at Continental Airlines.  Ornstein was previously employed by the company from 1988 to 1994, as Executive Vice President and as President of the company’s WestAir Holding, Inc., subsidiary.

Supporting paragraphs: James T. Prokopanko The Mosaic Company
Answer: The Mosaic Company