Question: Pieter 'Piet' Klijnveld, was a Dutch accountant who started a practice that after several mergers would grow into which professional service company and one of the Big Four auditors, along with Deloitte, Ernst & Young (EY), and PricewaterhouseCoopers (PwC)?
Context: WTP Advisors is an international-tax advisory and consultancy firm.  Inc.  Magazine ranked the company as one of the fastest growing businesses in the United States in 2011, 2012, 2013.  The 2012 Inc. 500 and 5000 survey ranked WTP Advisors at 1,184; within the business products and services category, the company ranked 75th.  The company was founded in 2005 by Ian Boccaccio, Michael Minihan, David Wain and James Fyhrie all former employees of PricewaterhouseCoopers.  The partners saw an opportunity to provide international tax consulting for small and medium businesses and be competitive with the “Big Four” accounting firms: PricewaterhouseCoopers, Ernst & Young, Deloitte Touche Tohmatsu and KPMG. PricewaterhouseCoopers (doing business as PwC) is a multinational professional services network headquartered in London, United Kingdom.  It is the second largest professional services firm in the world, and is one of the Big Four auditors, along with Deloitte, EY and KPMG.  Vault Accounting 50 has ranked PwC as the most prestigious accounting firm in the world for seven consecutive years, as well as the top firm to work for in North America for three consecutive years. Pieter 'Piet' Klijnveld (16 August 1874 – 9 February 1945) was a Dutch accountant who started a practice that after several mergers would grow into the international accounting firm KPMG. Arthur Andersen LLP, based in Chicago, is an American holding company and formerly one of the "Big Five" accounting firms among PricewaterhouseCoopers, Deloitte Touche Tohmatsu, Ernst & Young and KPMG, providing auditing, tax, and consulting services to large corporations.  In 2002, the firm voluntarily surrendered its licenses to practice as Certified Public Accountants in the United States after being found guilty of criminal charges relating to the firm's handling of the auditing of Enron, an energy corporation based in Texas, which had filed for bankruptcy in 2001. Klynveld Kraayenhof & Co. (KKC) was a Dutch accountancy firm founded in 1917 by Piet Klijnveld and Jaap Kraayenhof, who was one of Klynveld's former employees at another firm.  The firm specialized in banking and exporting and kept its independence by serving Dutch clients who were expanding throughout Europe and South America.  In 1979, KKC merged with Deutsche Treuhand-Gesellschaft (DTG) and McLintock Main Lafrentz to form Klynveld Main Goerdeler (KMG).  In 1987 KMG joined forces with Peat Marwick International (PMI) in the first mega-merger of large accounting firms and formed what is now known today as KPMG LLP. KPMG is a professional service company and one of the Big Four auditors, along with Deloitte, Ernst & Young (EY), and PricewaterhouseCoopers (PwC). Eugene O'Kelly was a former Chairman and CEO of KPMG, one of the largest U. S. accounting firms and one of the Big Four auditors. James Marwick (b. 1862 in Edinburgh, Scotland) was an original founder of an accounting office that became one of the Big Four auditors, KPMG. EY (formerly Ernst & Young) is a multinational professional services firm headquartered in London, England.  EY is one of the largest professional services firms in the world and is one of the "Big Four" accounting firms. The University of Queensland Business Association Inc. ("UQBA") is an organisation established to facilitate the professional development of the students of the University of Queensland.  UQBA works with the University of Queensland Faculty of Business, Economics and Law, as well as several industry partners including Boston Consulting Group, Chartered Accountants Australia and New Zealand, CPA Australia, Deloitte, Ernst & Young, KPMG and PwC.
Answer: KPMG