Guillermina Ester, Arbitration and Litigation Partner, Pérez-Llorca

Guillermina Ester is a partner in Pérez-Llorca’s Arbitration and Litigation practice area. She joined the firm in 2005 and was named partner of the practice in 2010. Prior to this she worked at a prestigious international firm for five years. Guillermina Ester’s practice is focused on civil, commercial and corporate litigation and arbitration. She advises and defends the interests of both national and international clients on complex pre-litigious and litigious matters (before tribunals of all instances and in arbitrations). Guillermina’s practice covers a wide range of conflicts such as those arising from contractual disputes (relating to joint ventures, sale and purchase agreements, distribution, construction and EPC contracts, and price adjustments), corporate litigation (such as directors’ liability or shareholders’ disputes), unfair competition and banking litigation. Guillermina lectures on litigation and arbitration for the Master’s degree for Access to the Legal Profession at the Universidad Carlos III de Madrid. She also regularly lectures on litigation and arbitration for various seminars and conferences.

Sonsoles Centeno, Competition and EU Law Partner, Pérez-Llorca

Sonsoles Centeno is a partner in Pérez-Llorca’s Competition and EU Law practice. Sonsoles joined Pérez-Llorca in 2021 as a partner in the European Union law practice area, and she is the managing partner of the office in Brussels. She is a State Advocate on leave of absence, and an expert in litigation and regulation. Sonsoles has in-depth knowledge of the European institutions and has more than 18 years of experience in different positions working for the Government. Prior to joining the firm, she was Deputy Director General for European Union and International Affairs (Ministry of Justice), Chief State Advocate before the Court of Justice of the European Union (Ministry of Foreign Affairs, European Union and Cooperation) and Agent of the Kingdom of Spain. Previously, she held the position of State Advocate-Legal Adviser at the Permanent Representation of Spain to the European Union in Brussels, she was legal secretary of the General Court of the European Union, and was State Advocate before the National High Court (Administrative Chamber), and before the Central Administrative Courts. Sonsoles has contributed to different publications and specialised journals.

Nicolaj Kuplewatzky, Référendaire, Court of Justice of the European Union

Nicolaj Kuplewatzky is a Référendaire at the Court of Justice of the European Union. He has almost 10 years of experience in EU Law and international matters and he has developed his career as an associate in different international law firms as well as in European institutions such as the European Commission. He has in-depth experience in preparing draft opinions for discussion with the Advocate General in all areas of EU law, researching case law and producing relevant written analyses. He also assists in hearing preparations and drafts questions to parties. He has been involved in cases in a broad spectrum of fields, including constitutional law and the Charter of Fundamental Rights, consumer protection, competition, data protection, the environment, private international law, social policy, and tax. He is a member of several international organisations and has contributed to different publications and specialised journals.

Jurgita Meškauskaitė-Cilliers, Research Manager, EMEA Chambers and Partners

Jurgita graduated with an MA in Development Management from the University of Westminster in 2007. She previously worked as a business journalist in Lithuania and has freelanced in London. She is fluent in both Russian and Lithuanian.