Professor Elsisi is counsel at Sidley Austin LLP and a member of its Global Arbitration, Trade and Advocacy practice, where he focuses his practice on public international law and international arbitration. He represents sovereign governments and State-owned entities, as well as foreign investors and multinational corporations, in international arbitration and cross-border disputes. He also represents sovereign States before various international courts and tribunals, including the International Court of Justice, and advises governments on matters involving public international law issues, including boundary and maritime disputes, deep-sea mining and joint-exploration agreements, secession and recognition of sovereign States, transboundary river disputes, diplomatic and consular immunity, and State succession.

Professor Elsisi has nearly 20 years of experience in dispute resolution in the Middle East, where he served as a prosecutor and a judge in Egypt. He was a legal advisor to the Egyptian Minister of Investment, where he negotiated settlement agreement with foreign investors, rendered advice on bilateral investment treaties, and drafted major investment and financial-related legislation. He also acted as legal counsel at Permanent Court of Arbitration (“PCA”), in The Hague, where he was responsible for handling PCA administered arbitration proceedings, including State to State, investor-State, and contract-based arbitrations.

Beyond his role at the PCA, his international practice includes working at the United Nations Office of Legal Affairs in New York, the Appellate Body Secretariat of the World Trade Organization in Geneva, and the World Bank in Washington D.C.