Katerynchuk was born on 19 November 1967 in the village of Lugovoye [ru], in what is now Russia's Altai Krai and what was then part of the Soviet Union.

The helicopter was shot down by members of the mujahideen shortly after taking off, and Katerynchuk later credited the experience with both leading him to be religious and giving him an interest in improving the lives of others.

[citation needed] From 1992 to 1995 he was a legal consultant to INKO Bank in Kyiv, and he was a founder and attorney at Moor and Krosondovich, a Kyiv-based law firm, from 1995 until his election as People's Deputy.

[1] He was re-elected on the proportional list of the Our Ukraine Bloc in 2006 and 2007 before once again serving from the 13th electoral district from 2012 to 2014, this time as a member of Batkivshchyna.

[7] On 14 December 2006, Upon the invitation of the Organizing Committee of the European Movement of Ukraine over 500 representatives of different civic movements, organizations, small and medium business enterprises, students, teachers, state employees and political leaders gathered in Kyiv to found the liberal political party the European Party of Ukraine.

Since 2002 - initiated the Social Program "People's Attorney" in his electoral district in Vinnytsia oblast during the Parliamentary elections.