Osai is a human rights expert, lawyer, and civil society leader with extensive experience working in international development, with civil society organisations, grassroots movements, feminist networks, youth groups, governments, donors, and inter-governmental agencies. In her current role as Director of Policy, Public Affairs and Campaigns at Christian Aid, she leads Christian Aid's advocacy and public campaigning, and its research, policy, and learning in the UK and internationally, on key priorities, climate justice, gender justice, economic justice, peacebuilding and conflict prevention, good governance, and human rights. Previously, country director of Amnesty International Nigeria, Interim Pan-Africa Director Oxfam GB, Oxfam Pan African Programme manager, and state of the union coalition coordinator, in Nairobi, Kenya. She was also a human rights observer with the African Union Mission in Mali and the Sahel, and Deputy Executive Director, Alliances for Africa.

She has been recognized as one of the 18 phenomenal African feminists to know and celebrate. She was named one of 100 Most Influential Civil Society Leaders in Nigeria in 2021. She received the University of Wolverhampton Alumni Global Impact Award in June 2023. She holds a LLB from the University of Lagos, Nigeria, a LLM from the University of Wolverhampton, UK, and a practice diploma in International Human Rights from the College of Law England and Wales, UK. Twitter/Instagram: @livingtruely; LinkedIn: www.linkedin.com/in/osai-ojigho