Question: What is the person who Claude Mongeau succeeded the CEO of?

Context paragraphs:
Mouse Wreckers: Mouse Wreckers is a 1949 "Looney Tunes" short directed by Chuck Jones, starring Hubie and Bertie in their first pairing with the redesigned Claude Cat (an early, primordial version of the cat appeared in 1943's "The Aristo-Cat").  The short centers around Hubie and Bertie's attempts to move into a new home by chasing Claude out of the home.  Mel Blanc voices Bertie and an uncredited Stan Freberg voices Hubie.  The title is a pun on "house wrecker" or "home wrecker", where a house is destroyed, often figuratively, by a single person.  "Mouse Wreckers" was nominated for Academy Award for Best Animated Short Film for 1948, but lost to "The Little Orphan", a Tom and Jerry cartoon which was the fifth Oscar (of seven) given to the cat and mouse team.

Baron Hollenden: Baron Hollenden, of Leigh in the County of Kent, is a title in the Peerage of the United Kingdom.  It was created in 1912 for Samuel Morley, who had previously served as Governor of the Bank of England.  He was the son of Samuel Morley and Rebekha Maria Hope and the elder brother of Arnold Morley.  Lord Hollenden was succeeded by his son, the second Baron.  He was High Sheriff of the County of London in 1917.  In 1923 he assumed by deed poll the additional surname of Hope.  On his death the title passed to his nephew, the third Baron.  He was the only son of the Hon. Claude Hope Hope-Morley, younger son of the first Baron.  Lord Hollenden was an Alderman of the City of London.  s of 2014 the title is held by his son, the fourth Baron, who succeeded in 1999.

Financial Supervisory Authority (Iceland): The Financial Supervisory Authority (Icelandic: "Fjármálaeftirlitið (FME)" ) is the single supervisory authority for the financial sector in Iceland.  Companies regulated by the authority are commercial banks, savings banks, insurance companies, insurance brokers, credit institutions (investment banks and credit card companies), securities firms, securities brokers, mutual funds and pension funds management companies and other entities authorized to receive deposits.  The current CEO is Ms. Unnur Gunnarsdóttir, who succeeded the controversial Gunnar T. Andersen in March 2012.  Deputy CEO Ragnar Haflidason succeeded Jónas Fr Jónsson in October 2008 and Gunnar T Andersen took over as CEO in April 2009.  The first CEO was Pall Gunnar Palsson, who directed from 1999 to 2005.

Founder CEO: A founder CEO is a person who founded a firm by taking initiative and deciding to create their vision for a firm in actual life, and held the CEO position subsequently.  If the firm's CEO is not a founder or the founder CEO is succeeded, the firm is said to be led by a non-founder CEO, otherwise known as a successor CEO.  Research has highlighted differences among founder and non-founder CEOs that impact firm performance.  The negative and positive contributions identified in research include: stock performance, equity stake in the firm, managerial incentives, innovation investment, and outlook towards mergers and acquisitions.

Henri de Gondi (cardinal): Henri de Gondi (1572 – 13 August 1622) was a French bishop and cardinal of the Gondi family.  He was the son of Albert de Gondi, duc de Retz and Claude Catherine de Clermont-Tonnerre.  He succeeded his uncle Pierre de Gondi as bishop of Paris in 1598 and was succeeded on his death by his younger brother Jean-François de Gondi.  He was made a cardinal in 1618.

Jeremy Weir: Jeremy Weir (born 1964) is an Australian geologist, banker and businessman, the CEO of Trafigura since March 2014, when he succeeded Claude Dauphin.

Mitch Bainwol: Mitchell Burt Bainwol (born March 2, 1959) is a trade association executive currently serving as the President and CEO of the Alliance of Automobile Manufacturers.  He previously was Chairman and CEO of the Recording Industry Association of America (RIAA) from 2003 (when he succeeded Hilary Rosen) until 2011.  Prior to filling that position, he worked for 25 years in politics and federal policy-making.  In August 2011, Cary Sherman succeeded Bainwol as chairman and CEO of the RIAA, and Bainwol became the President and CEO of the Alliance.

Claude Mongeau: Claude Mongeau is a Canadian railroad executive who served as the President and Chief Executive Officer of Canadian National Railway (CNR) from January 1, 2010 to July 1, 2016.  He succeeded Hunter Harrison.  During his tenure as President of CN, he ""tried to improve ... frayed relations with the railway’s customers and partners through a series of service agreements.""

Kevin Tsujihara: Kevin Tsujihara (born October 25, 1964) is an American businessman serving as chairman and CEO of Warner Bros.  Entertainment.  He succeeded Barry Meyer as CEO on March 1, 2013 and as chairman in December 2013, having previously served as President of Warner Bros.  Home Entertainment.  Upon assuming the role of CEO, Tsujihara became the first person of Asian descent to run a major Hollywood studio.

E. Hunter Harrison: Ewing Hunter Harrison (born November 7, 1944) is a railway executive who served as the CEO of Illinois Central Railroad (IC), Canadian National Railway (CN) and Canadian Pacific Railway (CPR), and now serves as CEO of CSX.

Supporting paragraphs: Claude Mongeau E. Hunter Harrison
Answer: CSX