Marcin Wiącek is Polish Ombudsman (Commissioner for Human Rights) and a professor of the University of Warsaw. He is the head of the Human Rights Department of the Faculty of Law and Administration of the University of Warsaw. His areas of specialty are constitutional law and human rights.

He graduated from the Faculty of Law and Administration of the University of Warsaw as well as the Center for American Law (2006). In 2009, he defended his doctoral dissertation regarding a court’s question of law to the Constitutional Tribunal. In 2013, he was awarded the degree of habilitated doctor, after passing the post-doctoral degree examination and defending his dissertation on the possibility of application of the constitutional regulations, by courts and the Constitutional Tribunal, in cases originating in the post-war period.

Since 2019, he has been a professor at the University of Warsaw. In 2003–2007 he worked in the Constitutional Tribunal. In 2007–2021, he was employed at the Jurisprudence Division of the Supreme Administrative Court. In 2014–2018, he was a member of the Prime Minister’s Legislative Council. In 2014–2016, he was responsible for legislative traineeship at the Government Legislation Center. He was also a member of the National Committee on Spatial Planning and Architecture. Member of the Research Centre on Legal Aspects of Blockchain Technology, operating within the Faculty of Law and Administration of the University of Warsaw.

Author of over one hundred scientific publications, in particular on constitutional law, constitutional justice, administrative courts and human rights protection. Participant of numerous scientific conferences, including international ones.

He has cooperated as an expert with numerous public bodies, including the Chancellery of the President of the Republic of Poland, the Sejm Bureau of Research, the Office of Commissioner for Human Rights, the Government Legislation Center, the Supreme Audit Office, the National Council of the Judiciary, the Ministry of Justice, the Ministry of Development, the Ministry of Agriculture and Rural Development, the Ministry of the State Treasury, the Ministry of Finance, the Municipal Office of Warsaw and the Marshal of the Mazowieckie Voivodeship.

In 2021 Polish Parliament appointed him as the Ombudsman (Commissioner for Human Rights).