After just one season with Ajax, the 53-year-old coach replaces Thomas Tuchel at the Bundesliga side, but what can they expect from him?
As he arrives in Germany to start his new job as Borussia Dortmund coach, Peter Bosz will take charge of his fourth team in two years and biggest of his career.
It has been a rapid rise for the 53-year-old, who went from mid-table Vitesse in 2015 to Maccabi Tel Aviv and then to Ajax a few months later to lead a vibrant young side to the Europa League final.
Although it ended without a trophy and in a dismal display against Manchester United in Stockholm, his single year in Amsterdam has given his reputation a huge boost.