Mishcon de Reya LLP Promotes Margrit Trein To Legal Director In International Arbitration Team

Mishcon de Reya promotes Margrit Trein to Legal Director in its international arbitration team in London.

Update: 2026-04-02 13:00 GMT


Mishcon de Reya LLP promotes Margrit Trein to Legal Director in International Arbitration team

The prominent British international law firm and professional services group, Mishcon de Reya LLP has promoted Margrit Trein (Legal Director – International Arbitration) in its London office. In her new role, she will contribute to leading the firm’s international arbitration and public international law practice.

Sharing her thoughts on the promotion, she said,

“I’m pleased to share that I have been promoted to Legal Director in Mishcon de Reya LLP's International Arbitration team. I’m excited and grateful for the opportunity to help lead the growth of our international arbitration and public international law practice.”

Experience

Margrit Trein has been associated with Mishcon de Reya LLP for over a year and a half, most recently serving as Managing Associate in the International Arbitration team before her elevation to Legal Director.

Prior to this, she worked with Simmons & Simmons as a Consultant and Contract Lawyer in International Arbitration, handling complex arbitration matters across jurisdictions.

She spent over six years at Eversheds Sutherland, where she progressed from Associate to Senior Associate in Litigation & Dispute Resolution, focusing on international arbitration and public international law. Her earlier experience also includes roles as a Trainee Solicitor at Eversheds and as a Paralegal at Wilmer Cutler Pickering Hale and Dorr and Berwin Leighton Paisner.

In addition, she has contributed to academia and research as a Student Research Assistant at the Grotius Centre for International Legal Studies and as a Student Coach for the Telders International Law Moot Court Competition at Leiden University.

Education

Margrit Trein holds a Master’s degree in Public International Law (Cum Laude) from Leiden University. She also completed a Summer School in International Commercial Litigation and Arbitration from The London School of Economics and Political Science (LSE).

She earned her Bachelor of Laws (LLB) from The College of Law (London) and holds a Master of Arts in International Relations, along with a Bachelor of Arts in Politics and Spanish, from the University of Exeter.

Mishcon de Reya LLP is a prominent British international law firm and professional services group, employing over 1,400 people and 650+ lawyers with offices in London, Oxford, Cambridge, Singapore, and Hong Kong. It specializes in high-stakes litigation, corporate, and private client work, often handling complex, international matters. 

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