Marlén Estévez Sanz is a lawyer, international mediator, and one of the leading voices in conflict resolution, negotiation, and leadership in the Spanish-speaking world. For more than 20 years, she has advised companies, institutions, and leaders in highly complex disputes, handling more than 100 national and international arbitrations and matters worth up to €800 million.
Her work is based on one conviction: analyzing a conflict is not the same as understanding it. Before moving another person, a leader must understand what is also happening within themselves. From this perspective, she has developed her own approach around the culture of agreement, listening, and conscious leadership as tools for making better decisions, building trust, and transforming seemingly irreconcilable positions.
She is the founder and president of Women in a Legal World, an international network bringing together more than 2,000 female executives in more than 15 countries, and founder of Más Cultura del Acuerdo. In 2024, she directed the book De la cultura del litigio a la cultura del acuerdo and, together with Eliseo Martínez, translated into Spanish Challenging Conflict: Mediation Through Understanding, by Gary Friedman and Jack Himmelstein, one of the internationally recognized reference works on mediation.
She has spoken at the World Economic Forum in Davos, the United Nations in New York, three Ibero-American Summits of Heads of State, and numerous international forums across Europe and Latin America. Forbes has recognized her among Spain’s most prominent lawyers, and she has been included in various rankings of the country’s leading and most influential women.
She is a professor of arbitration, mediation, and negotiation and has completed leadership and senior management programs at Harvard, Wharton, and ESADE. She is an accredited mediator with CEDR London and the Singapore International Mediation Centre. She speaks Spanish, English, and French. She chairs the Madrid Business Mediation Center (CMEM) and the Mediation Section of CIAM-CIAR, and serves as Secretary of the Ibero-American Section of the Royal Academy of Jurisprudence and Legislation. She directs various programs, including Legal Leadership, resulting from the collaboration between Harvard and WLW.