The idea that Barolo was once a sweet wine and that it took a French oenologist to turn it into a dry wine has been recently challenged, based on new research, by Kerin O'Keefe. According to this revision of Barolo's history, Paolo Francesco Staglieno was responsible for the modern dry version. He was the author of a winemaking manual, "Istruzione intorno al miglior metodo di fare e conservare i vini in Piemonte", published in 1835. It was Staglieno who was called upon by Camillo Benso, conte di Cavour, who appointed him to the position of oenologist at his Grinzane estate between 1836 and 1841. Staglieno's task was to produce quality wines geared towards ageing and stable enough to be exported. Staglieno fermented the wines dry, something that at the time was referred to as "the Staglieno method". Oudart was a grape and wine merchant, not an oenologist, who in the early 1800s moved to Genoa and set up a winery, Maison Oudard et Bruché. By the time Oudart turned up in Alba, King Carlo Alberto and Cavour were already following Staglieno's guidelines and both were producing dry wines. This revised version of the history of Barolo was positively accepted by other experts.