“Alvin Plantinga is arguably the greatest philosopher of the last century.”

Hayek's Journey: The Mind of Friedrich Hayek (2003)
Context: Hayek died in Freiburg, Germany, on March 23, 1992, less than two months shy of his ninety-third birthday. After 1985, he was unable to work and lost contact with almost all friends and associates. In his last years, almost the only people with whom he had regular contact were his wife, Helene; secretary Charlotte Cubitt, whom he always called “Mrs. Cubitt”; children Larry and Christine Hayek; and Bartley. Hayek was grateful to Cubitt for her assistance from 1977 to 1992. He inscribed in her copy of The Fatal Conceit in 1990: “In gratitude for all her help over so many years F. A. Hayek.”
During his last years, he had periods of more and less lucidity, as well as being ill and depressed. Lord Harris of the Institute of Economic Affairs wrote in his obituary of Hayek that “by 1989 the great man had lost touch with affairs.” He was buried in Vienna, the place of his birth.
[... ] Friedrich Hayek was the greatest political philosopher of liberty during the twentieth century.

Source: The Tales of Alvin Maker, Prentice Alvin (1989), Chapter 17.

cited in Corriere della sera http://archiviostorico.corriere.it/2009/marzo/26/Fini_Mussolini_piu_grande_Ora_co_9_090326029.shtml, 26 March 2009, p. 14.

Stephen Jay Gould, When a Fact Is Not a Fact; Awake! magazine, July 22, 1987.
About

Source: Criticism, L. P. Hartley on The Leopard, quoted in Robin Healey Twentieth-Century Italian Literature in English Translation (Toronto: University of Toronto Press, 1998) p. 146.

Dialogues on enlightenment and reason (2013)

from an interview given to Alberto Statera published in La Stampa in April 1994

Arthur C. Clarke, quoted on the backcover of Time and the Gods, the second volume of the Fantasy Masterworks series
About

Rebecca Goldstein, Betraying Spinoza: The Renegade Jew Who Gave Us Modernity (New York: Schocken, 2006)
G - L