Prince Hassan served as Crown Prince from 1965 until 1999. He played a key role in peace negotiations between Jordan and Israel that culminated in the Peace Treaty between the Hashemite Kingdom of Jordan and the State of Israel in 1994.
Prince Hassan established the Arab Thought Forum, the Royal Institute for Interfaith Studies, the Higher Council for Science and Technology, the Royal Scientific Society, the West Asia-North Africa Institute, and the Regional Security Centre. His international activities included co-chairing the Independent Commission on International Humanitarian Issues and serving as Commissioner on the Commission on the Legal Empowerment of the Poor.
Prince Hassan currently serves as honorary co-chair of the World Refugee and Migration Council and is also involved in developing food security country-wide policy and strategy. He is the author of several books, including, A Study on Jerusalem, Search for Peace: The Politics of the Middle Ground in the Arab East, Palestinian Self-Determination: A Study of the West Bank and Gaza Strip.