wow, I think it's the first time I see an archive photo of the Bugatti Royale Coupé Napoléon on the road!
It is Louis Renault, who came second with his Renault Type AK in the 1903 Paris-Madrid race. The race was stopped at Bordeaux due to numerous fatal accidents, including that of his brother Marcel in another Renault Type AK. In the photo, Louis is probably learning about his brother's accident...