Hadeel Qazzaz was born in Gaza Shati refugee camp, a specialist in education, gender, and development. She received her Ed.D. from Leeds University with a thesis on adult non-formal education in developing countries, using the case of Palestinians in Israeli prisons. Qazzaz has published research reports on civic attitudes of Palestinian high school students and has contributed to Palestinian human development reports, the Palestine national poverty report, the Palestine time-use survey, and reports on the right to education. She was involved in the adaptation of the Transparency International Source Book into Arabic. This enriching experience has enabled her to work closely with researchers and activists from many Arab countries and Germany. She is an activist in the Palestinian women's movement and active member in the Palestinian civil society movement. She is involved in different types of cultural dialogue and exchange including dialogue between Europe and the Middle East. She has organized and has participated in many regional and international conferences that dealt with issues of development, women's rights, and democratization processes.

She is married and the mother of three children.

Hadeel joined Tiri in April 2009 as Programme Director responsible for Tiri’s Pro Poor Integrity Programme.