In the early 1990s Kozub worked at a representative office of Maruni brand in Ukraine (Zaporizhzhia; the founder).

In autumn 2006, Kozub became a co-founder of the Biruchiy contemporary art project on Byriuchyi Island spit in the Sea of Azov.

[4] Since the project's foundation, Kozub has organized it in the main residence (Byriuchyi Island, since 2006; 14 seasons, 208 artists, 11 art groups, 16 countries); in offsite residences in Ukraine (Irshansk, Zhytomyr Oblast, 2015) and Poland (Klementowice, Lublin Voivodeship, 2016–2017);[5] exchanging participants with art residences in Italy (Biella, 2013–2017) and the United States (New York City, 2017–2018); shooting films by Italian directors on Byriuchyi Island (2015–2016); project exhibitions in Ukraine (Zaporizhzhia, Kyiv, Koktebel, Kharkiv, Lviv, Melitopol, Khmelnytskyi; since 2006), Canada (Montreal, 2013) and Italy (Turin, 2017).

He is at the 29th place in the rating of collectors of Ukrainian contemporary art according to Forbes Ukraine magazine.

[8] The artworks were presented at a retrospective exhibition dedicated to the tenth anniversary of the Biruchiy contemporary art project in Kyiv in 2015.

[12] The works are kept in private collections in Ukraine, Russia, Germany, Switzerland, Canada, USA, and Japan.