[3] While in her final year of law school, Hassan co-founded the Woomera Lawyers Group, a refugee advocacy organization that provided legal services to asylum seekers detained in Australia.

[4][5] In August 2022, Hassan became the acting executive director for Human Rights Watch after Kenneth Roth retired from the role.

[6] Before taking the position, Hassan worked as the deputy executive director and chief programs officer, overseeing the organization's research, legal and policy, communications, and advocacy departments.

[8] As a researcher, Hassan published reports on violence against women in Cote d’Ivoire and Somalia, uprisings in Egypt in Bahrain, the Red Shirts political movement in Thailand, armed conflict in Libya, Sudan and South Sudan, child recruitment and attacks on schools in Somalia, sectarian violence in Burma and armed conflict in Iraq.

[10] Prior to attending law school, Hassan was a social worker in Los Angeles, California, London, United Kingdom, and Adelaide, Australia.