With a Ph.D. in Law, he is currently Assistant Professor in the Financial Law Department, at the Faculty of Law and Administration, Warsaw University, and has long been a university lecturer. He achieved excellent results in his final exams to become a judge and a legal advisor. Since 2003, he has acted as legal advisor. For many years he has been providing legal assistance, as part of which he has conducted disputes before common courts as well as before the tax authorities and administrative courts. He is also experienced in ongoing legal assistance and legal co-ordination of large projects, including those involving copyrights as well as art and culture. He used to be on the supervisory board of a major energy company in Poland. His advice, as an expert at the Bureau of Research of the Chancellery of the Sejm (Biuro Analiz Sejmowych), was sought on many occasions during the legislation process. He was also a member of the Tax Law Consultative Committee (Rada Konsultacyjna Prawa Podatkowego) at the Ministry of Finance and of a number of international associations grouping experts and practitioners of tax law.