In my thesis I want to present Nick Leeson’s amazing story in details, how he ruined his own and his wife’s life even though they had a perfect life, and the fact, that people does not learn from history, because similar events had happened since then, basically the same patterns can be recognize in many cases at many banks, and the same problems and faults can be originate in the case of the global crisis which got us into the current situation. In the end of the thesis, I will highlight the points, how he could have avoided ending up like this, how series of small faults caused the loss of this amazingly huge amount of money, and how banks can precede similar cases to happen in the future, and how avoid the injustice which always firstly reach the poor layers of the society, if it is even possible to tell.