Guillermina Ester

Guillermina Ester is a partner in Pérez-Llorca’s Litigation and Arbitration practice. She joined Pérez-Llorca in 2005 after working at a leading international firm for five years and was made a partner in the Litigation and Arbitration practice in 2010. In 2006–2007, she completed a secondment at Slaughter and May (London).
Her practice focuses on civil, commercial and corporate litigation and arbitration. Guillermina advises and represents the interests of national and international clients in complex matters, both before proceedings begin and during litigation or arbitration (before courts at all levels and in arbitration). She advises on a wide range of matters, including disputes arising from breaches of contract (joint ventures, sale and purchase, distribution, construction, EPC and price adjustments), corporate disputes (i.e. directors’ liability), unfair competition and banking litigation, among others.

Education

• 2018 General Management Programme (PDG), IESE Business School 1999 Law degree, Universidad Carlos III de Madrid 1997 International Law Programme, Universiteit van Amsterdam

Academic Activities

• Guillermina teaches litigation and arbitration on the Master’s in Access to the Legal Profession at Universidad Carlos III de Madrid.
• She also regularly teaches litigation and arbitration at various seminars and conferences.

Memberships

• Madrid Bar Association (ICAM). Spanish Arbitration Club (CEA).

Awards and Recognition

• Guillermina Ester has been recognised in several legal directories, including: Chambers Global: ‘Dispute Resolution’. Chambers Europe: ‘Dispute Resolution’. Leaders League: ‘Commercial Litigation’ and ‘International Arbitration’. Who’s Who Legal: Litigation 2019 Best Lawyers®: ‘Arbitration and Mediation’, ‘Litigation’ and ‘Construction Law’. Financial Times Innovative Lawyers: finalist, Highly Commended, ‘Most Innovative Law Firms in Dispute Resolution’ (2019) (recognising a matter on which Guillermina Ester advised). Iberian Lawyer: 40 under Forty (2013). Universidad Carlos III: Excellence Award (2013).

Publications

• “Regulating the activities of online service platforms: the BlaBlaCar case and the decisive influence test in the underlying activity”, Diario La Ley, No. 9554, Tribuna section, Wolters Kluwer; January 2020 “What procedures are available to recover an occupied building?”, Metros2; September 2018 “The ‘decisive influence’ test: the ECJ judgment on Uber”, International Bar Association, Legal Practice Division, International Litigation Newsletter; May 2018 “Progression of women in the Spanish legal sector”, International Bar Association, Section on Public and Professional Interest, Women Lawyers’ Group; September 2017 “Court issues milestone ruling for sharing economy and digital platforms”, International Law Office; March 2017 “BlaBlaCar: a case of resistance”, Expansión; March 2017 “Mutual benefit society vs. company. Sale and purchase of shares in an insurance company”, Práctica contenciosa para abogados, Wolters Kluwer; 2016 “The European Arbitration Review 2017: Spain”, chapter in Global Arbitration Review; November 2016 “International Fraud & Asset Tracing. Spain chapter”, chapter in Jurisdictional Comparisons, European Lawyer Reference, third edition 2015, Thomson Reuters; December 2014 “International Civil Fraud. Spain chapter”, chapter in International Civil Fraud: Jurisdictional Comparisons, European Lawyer Reference Series; May 2014 “Insolvency law developments under Law 14/2013 of 27 September on support for entrepreneurs and their internationalisation”, Fiscal&Laboral; November 2013