Nencini was born at Barberino di Mugello, in the province of Florence.

He is the nephew of professional cyclist Gastone Nencini, winner of the 1960 Tour de France.

[1] In 2013 Nencini was elected to the Chamber of Deputies among the ranks of the Democratic Party.

From 28 February 2014 to 1 June 2018 he served as deputy minister of infrastructure and transport in the governments led by Matteo Renzi and Paolo Gentiloni.

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