The Chairman of the Ukrainian Helsinki Human Rights Union. He had graduated from the National Academy of Jurisprudence, Law Department, and since 2003 he has been working in the field of human rights. He has more than 40 petitions to the European Court of Human Rights under his belt. He is the expert of the working group for preparation project of the Procedural Criminal Code of Ukraine from the National Commission on strengthening democracy and supremacy of justice at the President of Ukraine. The author of nine books and many publications on human rights.