Lubbers, Boer & Douma

In August 2003, Allard Lubbers was appointed as Professor of Tax Law at Leiden University. He specializes in the determination of ‘profits’ for (corporate) income tax purposes and in procedural tax law. He wrote a number of books (in Dutch), including 'Reading and analyzing decisions of the Supreme Court' and 'Sound business practice'. He has published widely in the areas of his specialization. To mark the 100th anniversary of the Tax Chamber of the Supreme Court in 2016, Allard was awarded the prestigious title ‘Watcher of the Dutch Supreme Court’. Allard was a deputy judge the Courts of Appeal of Amsterdam and ‘s-Hertogenbosch between 2002 and 2017. Together with Koos Boer, Allard Lubbers is the founder of Lubbers & Boer B.V.

Koos Boer has been Professor of Tax Law at Leiden University since 2013. He was the Head of the Tax Law Department until February 2020. Prior to founding Lubbers & Boer BV with Allard Lubbers in March 2013, Koos practiced tax law at one of the Big Four tax law firms in the Netherlands. Koos is specialized in Personal and Corporate Income Tax Law. He wrote his dissertation (2011) on the tax law aspects of Anglo-American trusts. Koos publishes regularly in several legal journals (BNB, WFR and NTFR) and is an editor of Fiscaal Weekblad FED – a weekly case law journal. For years he was a deputy judge in the District Court of Haarlem and in the Court of Appeal of Arnhem-Leeuwarden. Koos gives lectures and teaches courses on various topics.

Sjoerd Douma is Professor of International & EU Procedural Tax Law at the University of Amsterdam. Prior to his appointment in October 2017, he was a professor at Leiden University. At the IFA Congress in Rio de Janeiro (2017), Sjoerd was appointed as a member of the Permanent Scientific Committee of the International Fiscal Association. Sjoerd has specialized in corporate income taxation, tax treaties, European tax law (including Fiscal State Aid) and procedural law. Sjoerd is the lead instructor in the massive open online course ‘Rethinking International Tax Law’ which has attracted more than 30,000 participants from all over the world. In 2017, Sjoerd received Coursera's Learners First Outstanding Educator Award, out of over 2,000 courses on Coursera. This award honours the instructor who best exemplifies the “Learners First” principle, as demonstrated by a combination of course ratings and course completions. Sjoerd has been a Deputy Judge in the Court of Appeals of Arnhem-Leeuwarden, a Deputy Judge in the District Court of Haarlem and Visiting Professor at Université Panthéon-Assas (Paris, France). He is a permanent contributor to leading Dutch and international tax journals. He has authored and co-authored numerous publications and reports on national, international and European tax law. In 2012, Sjoerd’s PhD thesis ‘Optimization of Tax Sovereignty and Free Movement’ won the prestigious bi-annual Dissertation Prize of the Dutch Association for Tax Research. Prior to joining Lubbers, Boer & Douma in March 2017, Sjoerd has practiced tax law at one of the ‘big four’ tax advisory firms for more than 12,5 years. Sjoerd has represented clients before the tax authorities, the Dutch tax courts (including the Dutch Supreme Court), the European Commission and the Court of Justice of the European Union. Sjoerd has acted multiple times as an expert witness in international arbitration and court proceedings. He has also acted as arbitrator. Before joining private practice, Sjoerd was a legal clerk at the Dutch Supreme Court, where he drafted judgments as well as opinions of the Advocate-General.