 His sister is married to UFC fighter Drew Dober who he fought against at .Hein is the author of the book titled "Polizei am Limit" - Police at the Limit" where he detailed the lack of resources and training in the Police force in Germany.Hein, as a former police officer and UFC fighter, wrote an article on the New Year's Eve sexual assaults in Germany in December 31, 2015 incident - the widespread sexual assaults, attacks and robberies which linked to the influx of asylum seekers occurred in Cologne, criticizing the political and legal system in Germany did not do enough to prevent such crimes.