Since his retirement from the Tribunal, Judge Ameli has been retained as an expert witness by Clifford Chance (London and Paris), DLA Piper (London and Paris) and Salans (London) in major foreign investment, bilateral investment treaty and international commercial arbitration cases, conducted under ICC or UNCITRAL Arbitration Rules. In these cases, he has opined on issues of Iranian law, UNIDROIT Principles of International Commercial Contracts and international investment law regarding expropriation and breach of contract in telecommunication and petroleum fields.