Prior to joining Willkie in 2014, Sylvain completed internships in Brussels in the tax law firm Afschrift. He also completed an internship in Paris within the litigation department of Intervista.

• Co-author of the chapter on Abuse of Dominant Position in Lamy Droit Economique, Wolters Kluwer, 2018
• Co-author of “Tax Rulings and State Aid Qualification: Should Reality Matter?”, published in European State Aid Law Quarterly, 2017/2 p. 233       
• Co-author of “Bury them deep: the Court of Justice annuls the Autogrill and Banco Santander judgments of the General Court”, published in European State Aid Law Quarterly, 2017/2 p. 310       
• Co-author of “The French Pension Case: The defense based on Compensation of Structural Disadvantage Consigned to Oblivion” published in European State Aid Law Quarterly, 2017/1, p. 82     
• Co-author of “IFP v. Commission : the Commission does not meet the standard of proof”, published in European State Aid Law Quarterly, 2016/3 p. 468
• Co-author of “Public Sales of Land in State Aid Law”, published in European State Aid Law Quarterly, 2016/1 p. 142
• Co-author of “Spanish Fiscal Aid Cases: the Good, the Bad and the Unclear”, published in European State Aid Law Quarterly, 2015/2 p. 295