Question: Who most recently served as Chief of Staff to the wife of the 47th Vice President of the United States?

Context paragraphs:
Linda Zecher: Linda Zecher (born May 4, 1953) is an American executive who is the Managing Director of The Barkley Group since January 2017.  She most recently served as the President, CEO and Director of Houghton Mifflin Harcourt, a global education and learning company.  In the past she had worked as the Corporate Vice President of the Microsoft Worldwide Public Sector business unit until September 2011.  Additionally she had served as the President and CEO of Evolve Corporation, as the Senior Vice President of Oracle, as a very early Vice President of PeopleSoft, and in several senior positions in Bank of America.  She began her career as a geophysicist with Texas Instruments.

Joe Biden presidential campaign, 1988: The 1988 presidential campaign of Joe Biden, the longtime Democratic United States Senator from Delaware and eventual 47th Vice President of the United States began on June 1987.  He ran for President of the United States in the 1988 United States presidential election.  He was considered one of the potentially strongest candidates in the field.  However, in September 1987, newspaper stories stated he had plagiarized a speech by British politician Neil Kinnock.  Other allegations of past law school plagiarism and exaggerating his academic record soon followed.  Biden withdrew from the race later that month.

Timeline of the presidency of Gerald Ford: The presidency of Gerald Ford began on August 9, 1974, when Gerald Ford became President of the United States, and ended on January 20, 1977, a span of days.  Ford, the 38th United States president, succeeded Richard Nixon, who had resigned from office.  Prior to this he was the 40th Vice President of the United States, serving from 1973 until President Richard Nixon's resignation in 1974.  He was the first person appointed to the vice presidency under the terms of the Twenty-fifth Amendment to the United States Constitution, following the resignation of Vice President Spiro Agnew on October 10, 1973.  Ford has the distinction of being the first, and to date the only person to have served as both vice president and president without being elected to either office.

Gerald Ford: Gerald Rudolph Ford Jr. (born Leslie Lynch King Jr.; July 14, 1913 – December 26, 2006) was an American politician who served as the 38th President of the United States from August 1974 to January 1977, following the resignation of Richard Nixon.  Prior to this he served eight months as the 40th Vice President of the United States, following the resignation of Spiro Agnew.  He was the first person appointed to the vice presidency under the terms of the 25th Amendment, and consequently the only person to have served as both Vice President and President of the United States without being elected to executive office.  Before his appointment to the vice presidency, Ford served 25 years as U.S. Representative from Michigan's 5th congressional district, the final nine of them as the House Minority Leader.

Carrol Chandler: Carrol Howard "Howie" Chandler (born March 16, 1952), is a retired United States Air Force four-star general.  He last served as the 35th Vice Chief of Staff of the Air Force from August 27, 2009 to January 14, 2011.  He previously served as Commander of Pacific Air Forces from November 2007 to August 20, 2009 and Deputy Chief of Staff for Operations, Plans and Requirements from October 23, 2005 to November 29, 2007.  As Vice Chief, he presides over the Air Staff and serves as a member of the Joint Chiefs of Staff Requirements Oversight Council and Deputy Advisory Working Group.  He assists the Chief of Staff with organizing, training, and equipping of 680,000 active-duty, Guard, Reserve and civilian forces serving in the United States and overseas.  He retired from the Air Force by March 1, 2011.  In 2012 he joined Pratt & Whitney Military Engines as Vice President, Military Business Development and International Programs.

Jill Biden: Jill Tracy Biden (née Jacobs , previously Stevenson; born June 3, 1951) is an American educator who is married to the 47th Vice President of the United States, Joe Biden.  She was the Second Lady of the United States from 2009 to 2017.

Joe Biden: Joseph Robinette "Joe" Biden Jr. ( ; born November 20, 1942) is an American politician who was the 47th Vice President of the United States from 2009 to 2017.  A member of the Democratic Party, he represented Delaware as a United States Senator from 1973 until becoming Vice President in 2009.

Germán Vargas Lleras: Germán Vargas Lleras (born February 19, 1962) is a Colombian politician who recently served as the 25th Vice President of Colombia under President Juan Manuel Santos Calderón.  A member of the Radical Change political party, he served four consecutive terms in the Senate, having been elected in 1994.  German Vargas also served in the Cabinet as the Minister of Interior and then as the Minister of Housing, City and Territory.  He was elected Vice President of Colombia in 2014, running alongside Juan Manuel Santos who was seeking re-election for a second term as President.  On the 15th of March 2017, Vargas Lleras resigned as Vice President in order to be eligible to run for President in the 2018 Presidential elections.

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.

Sheila Nix: Sheila Nix is an American political strategist, most recently serving as Chief of Staff to Jill Biden, the wife of Vice President Joe Biden since April, 2013.

Supporting paragraphs: Sheila Nix Jill Biden
Answer: Sheila Nix