Prior to joining JFBW, Mohyeddeen has worked with some distinguished members of the legal profession in global jurisdictions including Sir Ivan Lawrence QC, (UK) Dr. Selim Al Awa, (Egypt) John Platt-Mills QC,(NZ) Dr. Sami Selcuk (Turkey) Dr. Av Lamond (FR) Judge Elizabeth Lawson QC, (UK) and Christopher Cochrane QC (Cyprus & UK). He has also served as a director of Justice International, a leading legal organisation in the field of Justice, Human Rights and rule of law since 1992. As the director of Justice International, he is credited with transforming the organization into one of the world’s foremost international legal NGOs in the promotion of rule of law with extensive rights case loads, including some formidable and most challenging of the time.

As an international lawyer promoting rule of law and international human rights standards, Mohyeddeen assisted in the trial of Egyptian intellectuals before the Cairo Military Tribunal 1995, made legal representations in Tel Aviv
in the cases of Lebanese and Palestinian nationals unlawfully abducted and held without trial 1997, lead international legal team in Anwar Ibrahim trial in Kuala Lumpur 1998,
Assisted in the trial of Dr. Nazimettin Erbakan, before State Security Court, Malatya and the Constitutional Court, Ankara, 1998, observed the trial of General Augusto Pinochet, of Chile, on Crimes Against Humanity 1999
and presented investigations evidence for ICTY Trial in the Srebrenica genocide, 2001, Investigated atrocities in Arakan and evidence of 6000 witnesses to ICC on the Rohingya Ethnic cleansing trial 2017, and the Gaza Genocide 2024.

He played a pivotal role in building the global advocacy campaign against the trial of civilians before military tribunal under the authoritarian regime of the Egyptian brutal dictator Husne Mubarak. In 2008 Mohyeddeen successfully intervened in the case of Youssef Nada of Lugano place under United Nations Security Council Resolution 1267 blacklist (UNSC 1267)

The government of Switzerland and Italy withdrew all charges and following the judgement of the ECHR in September 2012 clearing him of any criminal responsibility, the US government also dropped its allegation in the case.

Mohyeddeen is a law graduate from UK and a post graduate from London School of Economics & Political Science (LSE) in international Laws. He was called to the Bar of England and Wales in 1985 and is a member of the Supreme Court Bar Association of Dhaka specialised in International Disputes Resolution, Corporate Law, Constitutional Law, Human Rights Law and Environmental Laws. He has written extensively on a wide range of human rights, devoting special attention to issues of universal jurisdiction, crimes against humanity, the debacle of international justice, the foreign policies of the major powers, and the work of the United Nations.

He is also the author of 'Human Rights in Egypt' and 'Distrust for Democracy', the former, a publication on the Human Rights issues which have plagued Egypt for decades and the latter, a publication on distrust for democracy by the majority of the Middle Eastern countries and ‘The plight of the Palestinians under occupation’.