In 2006, he was appointed as a special prosecutor responsible for supervising the police's organised crime and counter-terrorism activities.
[1] Papangelopoulos called for a prompt investigation into the large-scale blackout that took place a month before the 2004 Summer Olympics in Athens.
[3] Under the premiership of Kostas Karamanlis, Papangelopoulos served as Director General of the National Intelligence Service.
[5] In March 2015, he was appointed as Secretary General of the Ministry of Justice, Transparency and Human Rights.
[4] Papangelopoulos served as the interim Minister of Justice, Transparency and Human Rights in the Caretaker Cabinet of Vassiliki Thanou-Christophilou from August to September 2015 before returning to the Second Cabinet of Alexis Tsipras on 23 September as the Alternate Minister of Corruption Issues in the Ministry of Justice, Transparency and Human Rights.