Question: What is the net worth of the American businessman who argued that The Science of Success was a credible book because of its author's business success?

Context paragraphs:
T. Boone Pickens: Thomas Boone Pickens Jr. (born May 22, 1928), known as T. Boone Pickens, is an American business magnate and financier.  Pickens chairs the hedge fund BP Capital Management.  He was a well-known takeover operator and corporate raider during the 1980s.  As of November, 2016, Pickens has a net worth of $500 million.

Black billionaires: According to Forbes 2014 ranking of the world's billionaires, Nigerian business magnate Aliko Dangote with a net worth of $25 billion is the world's richest black person.  Others on the list are Nigeria's Mike Adenuga with $4.6 billion, American media mogul Oprah Winfrey with a net worth of $3.9 billion (2015) and South African gold magnate Patrice Motsepe, with $2.9 billion, Nigeria's Folorunsho Alakija with $2.5 billion and Mo Ibrahim, a British billionaire of Sudanese Nubian ancestry, who has been on the "Forbes" Billionaire list since 2008 and in 2012 had a net worth of $1.1 billion.

Anthony Pratt (businessman): Anthony Joseph Pratt (born 11 April 1960 in Melbourne, Victoria), an Australian businessman and billionaire, is the Executive Chairman of Visy Industries and Pratt Industries in America, which is the world’s largest privately owned packaging and paper company.  According to the 2017 "Financial Review" Rich List, Pratt and his family have a net worth of A$ 12.60 billion; making Pratt and his family the richest in Australia.  "Forbes" assessed Pratt's net worth in 2016 at 4.2 billion; listing his sisters' wealth independently.

Ivan Chrenko: Ivan Chrenko (born 1967/68) is a Slovak billionaire businessman, the chairman and majority owner of the Slovak real estate development company HB Reavis.  In March 2017, with an estimate net worth of US$1.1 billion, Chrenko became the first ever Slovak billionaire, according to "Forbes".  Prior to Chrenko, Andrej Babiš became the first person of Slovak origin with a net worth above $1 billion, but he later became a citizen of the Czech Republic.

Asset poverty: Asset poverty is an economic and social condition that is more persistent and prevalent than income poverty.  It can be defined as a household’s inability to access wealth resources that are sufficient to provide for basic needs for a period of three months.  Basic needs refer to the minimum standards for consumption and acceptable needs.  Wealth resources consist of home ownership, other real estate (second home, rented properties, etc.), net value of farm and business assets, stocks, checking and savings accounts, and other savings (money in savings bonds, life insurance policy cash values, etc.).  Wealth is measured in three forms: net worth, net worth minus home equity, and liquid assets.  Net worth consists of all the aspects mentioned above.  Net worth minus home equity is the same except it does not include home ownership in asset calculations.  Liquid assets are resources that are readily available such as cash, checking and savings accounts, stocks, and other sources of savings.  There are two types of assets: tangible and intangible.  Tangible assets most closely resemble liquid assets in that they include stocks, bonds, property, natural resources, and hard assets not in the form of real estate.  Intangible assets are simply the access to credit, social capital, cultural capital, political capital, and human capital.

Tamir Sapir: Tamir Sapir (birth name Temur Sepiashvili, Georgian: თემურ სეფიაშვილი ); 1946/1947 – September 26, 2014) was an American businessman and investor from the former Soviet republic of Georgia who made millions bartering fertilizer and oil with the Soviets in the 1980s; he took most of his money and put it into New York real-estate.  He was included in "The 400 Richest Americans List" of September 2008 (#246), with a net worth of $1.9 billion.  In March 2010, he ranked 721st on "Forbes"<nowiki>'</nowiki> list of billionaires, with a net worth of $1.4 billion.

David Ross (businessman): David Peter John Ross (born 10 July 1965) is an English businessman and one of the co-founders (with Charles Dunstone and Guy Johnson) of Carphone Warehouse.  At the peak valuation of his business interests in 2008, Ross was one of the 100 richest people in the United Kingdom.  In 2008, "Forbes" ranked him #843 in the world's richest billionaires; his net worth was estimated at US$1.4 billion.  In April 2015, the Sunday Times estimated his net worth at £1.0 billion

The Halo Effect (business book): The Halo Effect is a book by business academic Phil Rosenzweig that criticizes pseudoscientific tendencies in the explanation of business performance.  The book was published by Free Press on February 6, 2007.  As well as many business magazines and newspapers, the text targets specific books (those that offer secrets of guaranteed business success) and academic research published by business schools.  It outlines nine "delusions": mistakes of reasoning that undermine these recipes for business success.  In light of these mistakes, Rosenzweig argues, much of business writing is what Richard Feynman called "cargo cult science", having the superficial trappings of science but operating at the level of story-telling.  The book also considers some more scientific business research, whose conclusions are more rigorous but do not promise a simple recipe for success.  The subtitle of the 2007 US edition is "and the Eight Other Business Delusions that Deceive Managers" while that of the 2008 UK edition is "How Managers Let Themselves Be Deceived".

The Science of Success: The Science of Success: How Market-Based Management Built the World's Largest Private Company is a book written by Charles Koch in which he delineates his philosophy of Market Based Management (MBM).  Koch, the CEO of Koch Industries, Inc., wrote it in 2007.  While many similarly-titled books by other authors exist, T. Boone Pickens argues that Koch's immense personal business success lends credibility to the book's concept.

Björgólfur Guðmundsson: Björgólfur Guðmundsson (born 2 January 1941 in Reykjavík, Iceland) was the chairman and former owner of West Ham United FC.  Björgólfur was Iceland's second businessman worth more than a billion dollars — his son, Björgólfur Thor Björgólfsson being the first.  He was at one time the majority owner and chairman of the now nationalised Icelandic bank Landsbanki, the second largest company in Iceland.  He was ranked by "Forbes" magazine in March 2008 as the 1014th-richest person in the world, with a net worth of $1.1 billion.  In December of the same year Forbes revalued his net worth to $0 and on 31 July 2009 he was declared bankrupt by the Icelandic courts with debts of almost £500 million (96 billion ISK).

Supporting paragraphs: The Science of Success T. Boone Pickens
Answer: $500 million