In July, 2004, he was awarded the TR35 prize by Technology Review (the best 35 researchers in the world under the age of 35).

Afterwards, Google co-founders Larry Page and Sergey Brin cited HyperSearch when they introduced PageRank.

[2] He has been chief editor of the world standard for privacy on the Web (P3P), and co-author of the companion APPEL specification.

[3] Initiator of the Query Languages effort at W3C (see for instance QL'98[4]), he started the XML-Query project, deemed to develop the corresponding world standard for querying XML (XQuery), finally providing the due integration between the Web and the database world.

[6][7] On 8 June 2012 Marchiori announced, with an open letter,[8][9][10] that he had been excluded from the CTO position in the company "because someone else wants to do it instead of me.