Michał Wojciech Gajdus is an attorney at the Warsaw Bar Association. In 2013 he graduated with honors, with a mark of distinction and one of the best results in the year from the Faculty of Law and Administration at the University of Warsaw, after which he undertook doctoral studies at his alma mater in the discipline of legal sciences, teaching civil law, contract law and law on intangible property. His research interests include civil law, industrial property law and EU law; he is the author of scientific and press publications in these areas. He also completed his undergraduate studies at the College of Interdepartmental Individual Studies in the Humanities at the University of Warsaw, majoring in international relations. He served his lawyer's apprenticeship at the District Bar Council in Warsaw, then passed the bar exam in 2017 and started running a law office in Warsaw.

He specializes in handling complex litigation both before Polish courts, including the Supreme Court and the Supreme Administrative Court, as well as before international courts, i.e. the Court of Justice of the EU, the EU Court and the European Court of Human Rights, as well as before national and international arbitration tribunals. He has worked with top international law firms in Poland for more than 12 years; he is also a recommended lawyer in prestigious international legal rankings, including IAM Patents 1000, Managing IP and Legal500 in the litigation and intellectual property categories. He is involved in the activities of the Bar Association and its bodies. Deputy Disciplinary Ombudsman of the Warsaw Bar Association from 2021 to 2023, member of the Legislative Committee of the Warsaw District Bar Council and the Legal Education Committee of the Supreme Bar Council. He advises major international and domestic companies in the energy, pharmaceutical, mining, insurance, financial and telecommunications sectors. His experience includes handling disputes of a strategic nature and requiring economic and business discernment. He is an attorney in cases with a value exceeding several tens of billions of zlotys. He also advises on economic risk, intellectual property strategy and key investment decisions.

During the crisis of the rule of law in Poland, he became involved in defending the constitutional foundations of the functioning of the judiciary and the rights of citizens to a court of law, and became an attorney and defender of dozens of judges facing disciplinary proceedings for defending the independence of the courts and judicial independence. Among other things, he has appeared as a defense attorney before the Disciplinary Chamber and the Chamber of Professional Responsibility. He is an attorney for Polish judges in cases concerning the rule of law pending before the European Court of Human Rights and is the author of one of the first motions for the application of so-called interim measures in Polish cases. He has represented dozens of so-called "kamikaze judges" in appeals against resolutions of the so-called National Judicial Council formed after 2018. He also appeared in cases concerning the independence of the Polish judiciary before the Court of Justice of the European Union, including as an attorney in the case that ended with the CJEU's judgment of March 2, 2021, C-824/18. He deputized judges in cases concerning the determination of the status of persons appointed to serve as judges in the Supreme Court by the so-called new National Judicial Council.

In addition, he has been active in pro bono activities for war refugees from Ukraine, providing and co-organizing free legal advice for them.