P. Morgan and Cornelius Vanderbilt III, belonged to the Knickerbocker Club, the citadel of Patrician families (indeed, both already belonged to old prominent families at the time), Stillman and Harriman joined these two in the membership of the almost equally fashionable Union Club; Baker joined these four in the membership of the Metropolitan Club of New York (magnificent, but easier of access to new wealth); John D. Rockefeller, William Rockefeller, and Rogers, along with Morgan and Baker were listed as members of the Union League Club (the stronghold of Republican respectability); seven of the group belonged to the New York Yacht Club. Morgan belonged to nineteen clubs in all; Vanderbilt, to fifteen; Harriman, to fourteen.’ Allen then goes on to show how the descendants of these financial giants were assimilated into the upper class: ‘By way of footnote, it may be added that although in that year [1905] only two of our ten financiers belonged to the Knickerbocker Club, in 1933 the grandsons of six of them did. The following progress is characteristic: John D. Rockefeller, Union League Club; John D. Rockefeller Jr., University Club; John D. Rockefeller 3rd, Knickerbocker Club. Thus is the American aristocracy recruited.'" Christopher Doob wrote in his book Social Inequality and Social Stratification in U.S. Society: "Personal wealth has never been the sole basis for attaining membership in exclusive clubs. The individual and family must meet the admissions committee’s standards for values and behavior. Old money prevails over new money as the Rockefeller family experience suggests. John D. Rockefeller, the family founder and the nation’s first billionaire, joined the Union League Club, a fairly respectable but not top-level club; John D. Rockefeller Jr., belonged to the University Club, a step up from his father; and finally his son John D. Rockefeller, III, reached the pinnacle with his acceptance into the Knickerbocker Club (Baltzell 1989, 340)." Selected notable members Charles Francis Adams III (1866–1954), Ambassador, great-grandson of the sixth U.S. President John Quincy Adams (1767–1848), and a great-great-grandson of the second U.S. president and Founding Father John Adams (1735–1826). Member of the prominent Adams family His Royal Highness Prince Amyn Aga Khan, Imam of Nizari Ismailism His Royal Highness Prince Sadruddin Aga Khan (1933–2003), Imam of Nizari Ismailism. Statesman and activist who served as United Nations High Commissioner for Refugees from 1966 to 1977 Gianni Agnelli (1921–2003), principal shareholder of Fiat, and Italian Senator for life.