Sebastián is a lead partner in the Natural Resources, Project Development, and Environment practice at A/C/R Legal. His practice focuses on the comprehensive development of investment projects, water law, and natural resources for both domestic and international clients across industries such as energy, desalination, mining, water and sanitation utilities,infrastructure, and agribusiness. His work encompasses the design of regulatory strategies, the management of complex administrative and judicial proceedings, legal due diligence, the drafting of legal opinions, as well as the structuring and negotiation of strategic contracts.

Prior to joining A/C/R Legal, he was a founding partner of LAWGIC Abogados and served as a senior associate at Carey.

In the academic and institutional spheres, he is a professor at the Center for Water Law and Management at Pontificia Universidad Católica de Chile, a board member of the Chilean Water Law Association (AChDA), and a member of the Latin American Groundwater Association for Development (ALHSUD). He is the author of the book Ciclo integral del agua: Gestión y financiación sostenible en la experiencia de España y Chile (2018).

He has been widely recognized as a leading lawyer in Natural Resources and Water Law by prestigious international legal directories, including Chambers and Partners, The Legal 500, Leaders League, and Best Lawyers.

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