He started working as a journalist in 1995 in Košice in a local evening newspaper. Gradually he worked for several national daily and weekly newspapers as well as for television. He wrote about economy and crime and became one of the first investigative journalists in Slovakia. Later he switched to politics and currently works as a political commentator for JOJ television. After the murder of his colleague Ján Kuciak in February 2018, he co-founded the Ján Kuciak Investigative Centre and headed it for two years. He has written three novels based on his experiences as a journalist that have become bestsellers.