Gianroberto Casaleggio (Italian pronunciation: [dʒanroˈbɛrto kasaˈleddʒo]; born in Milan, 14 August 1954) is an Italian entrepreneur and political activist.
He is co-founder and chairman of Casaleggio Associati srl, an internet and publishing company that advises on network strategies, and editor of Beppe Grillo's blog. He is also co-founder, with Beppe Grillo, of the Five Star Movement, of which he is sometimes called "guru".
Casaleggio began his career working at Olivetti S.p.A, then, in the late 1990s, became CEO at Webegg SpA, an internet consulting company. Webegg suffered heavy losses (over €20 million) in the period 2002-2003, and Casaleggio was replaced as CEO of Webegg in 2003 by Giuseppe Longo, appointed to lead the company turnaround
In 2004 he founded Casaleggio Associates, an internet consulting company that carries out research on e-commerce in Italy and whose finding are presented at a conference held in Milan every spring (since 2006).
Casaleggio Associates has been since 2005 the editor of Beppe Grillo's blog as well as of some of Grillo's books. Casaleggio Associates was also editor of the web-blog of Antonio Di Pietro (until 2010), and the website of Chiarelettere, an editor, until 2013, when was dismissed following divergence over the editorial strategy. 
- Marco Alfieri (26 May 2012). "Grillo e l’ombra di Casaleggio il guru con il mito di Re Artù". La Stampa. Retrieved 19 December 2012.
- Emiliano Liuzzi (8 September 2012). "Il guru Casaleggio esce dall’ombra: "Non decido io"". il Fatto Quotidiano. Retrieved 20 December 2012.
- "Telecom Italia hands over Webegg control". MF Milano Finanza. 6 April 2004.
- Ettore Colombo (3 November 2012). "Grillo-Di Pietro, il piano per le elezioni"Ingroia candidato premier"". Il Messaggero. Retrieved 5 November 2012.
- Francesco Oggiano (8 July 2013). "Il guru dimezzato". Vanity Fair. Retrieved 8 July 2013.
- Paolo Bracalini (12 November 2012). "Quando Travaglio & C. mandarono a quel paese il guru a cinque stelle". il Giornale. Retrieved 19 December 2012.
- Official web site
- John Hooper, Italy's web guru tastes power as new political movement goes viral, The Guardian, 3 January 2013
- Peter Popham, Italy's web politicians post their dystopic vision, The Independent, 7 April 2013
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