Field of expertise: Environmental policy

Wiezik attended Viliam Paulíny Tóth grammar school and studied environmental protection at the Technical University in Zvolen, Slovakia. Following his studies, he obtained a doctorate at the same university and became a professor there.

In 2019, he was elected as a Member of the European Parliament for the Democrats, later defecting to Progressive Slovakia in 2021. An environmentalist, he became a member of the Committee on the Environment, Public Health and Food Safety (ENVI) as well as the Committee on Petitions (PETI).

Apart from his committee assignments, Wiezik is part of the European Parliament Intergroup on Climate Change, Biodiversity and Sustainable Development. He is also part of the European Parliament Intergroup on Seas, Rivers, Islands and Coastal Areas.

Wiezik's focus is on nature conservation and the environment. He sees nature conservation, a clean and healthy environment and a green transformation as solutions for people, regional development, modernisation and innovation, and the creation of resilient and diverse landscapes, both in Slovakia and in the EU.

In the 2023 Slovak parliamentary election, Wiezik won the mandate but did not enter the National Council of Slovakia, choosing instead to remain in the European Parliament.