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1993 – 1994 London Business School, London. Corporate Finance Program.

1986 – 1988 School of Industrial Organization (EOI), Madrid, Grenoble, Master in Business Administration (MBA).

1981 – 1986 Autonomous University of Madrid, Spain. Degree in Economics and Business Administration.




Marian Portero Collado is a Director in Econ One’s International Arbitration Group, based in Florida USA, as an economic-financial expert, leading research studies in determining economic, financial, socioeconomic and environmental damages analyses.  Marian has experience authoring expert forensic reports and testifying in international arbitration tribunals. International experience in leading and conducting complex investigations, due diligence, and developing case investigation frameworks and strategies supporting international arbitration cases. Based on her experience acquired in Accenture, Spain and the United States, in the sectors of FMCG, Infrastructure, Pharmaceutical, Telecom, Automotive, Construction, Financial Services and Insurance, Marian has participated in international projects in Eastern Europe, Africa and the Americas, providing economic, financial, socioeconomic and environmental forensic support services, including presentations as an expert witness in international arbitration tribunals.

Key expertise:

  • International experience in leading research studies and due diligence developing case frameworks and strategies.
  • Management and coordination of research processes and outcomes with Counsel and Experts.
  • Economic and financial disputes determining loss of profits in economic, socioeconomic and environmental damages and valuations.
  • Experienced author of expert forensic reports and testimony in international arbitration cases.
  • Sectors – FMCG, Infrastructure, Construction, Pharmaceutical, Telecom, Automotive and Financial Services.

Expert/Testimony Experience:

Marian is an expert on economic issues, specialized in leading research studies, valuations and determination of economic, socioeconomic & environmental damages, in the sectors of transport, infrastructure, construction, financial services and insurance. Marian has presented written and oral testimony as an expert in international arbitration tribunals, including the ICC, ICSID and PCA.


English, Español, Frances

International Experience:

United States, South and Central America, Europe, Africa, Eastern Europe.


Expert Resources and Insights