Throughout his professional career, he was affiliated with the editorial boards of TVN, TVN24, TVP1, TVP Info, Wprost, Nowa TV, Wirtualna Polska and Onet.

His father, Krzysztof Sekielski was a teacher of Russian language and worked in a high school in Bydgoszcz.

From 1997 until 2006 he was a reporter of Fakty TVN, covering, among others the Kosovo War, the sinking of the Kursk ship near Murmansk and the work of the investigative commission on the Rywin affair.

In 2006, Sekielski and Morozwoski, using a hidden camera, recorded talks between MP Renata Beger and several prominent politicians of Samoobrona party, that was in the governing coalition in Poland at the time.

From November 4, 2006 until January 25, 2008, Sekielski hosted his own show on TVN24, presenting the weekend releases of the Magazyn 24 godziny (The 24 Hours Magazine).

[4] From October 2012 until January 2015 he ran weekly morning broadcasts on Radio Tok FM; first on Mondays, then on Wednesdays.

[13] The film dealt with child sexual abuse in the Catholic Church in Poland and sparked a nationwide discussion, receiving more than 20 million views within the first 10 days of online screening.

A few hours after the premiere, the Primate of Poland Wojciech Polak and Archbishop Stanisław Gądecki issued their statements in the case.