She is the founder of the Tamar campaign in Kenya which acknowledges gender-based violence in society and empowers churches to address it.
She is the founder member of Circle of Concerned African Women Theologians St. Paul’s chapter in Kenya.
Her father was a member of the Seventh-day Adventist Church and her mother was a Quaker.
However, she was brought up by a Quaker grandmother who she referred to as her first pastor and theological educator.
[2] Mombo earned a Bachelor of Divinity degree from St Paul's United Theological College (now St. Paul's University, Limuru) and a Master of Philosophy degree from the Irish School of Ecumenics of Trinity College Dublin.
[3] Mombo completed her Ph.D. in 1998 at School of Divinity, University of Edinburgh as part of the Centre for the Study of Christianity in the Non-Western World.
[4][5] She wrote her Ph.D. thesis on the topic "A historical and cultural analysis of the position of Abaluyia Women in Kenyan Quaker Christianity: 1902-1979.
She has also served as the Director of International Partnerships and Alumni Relations at St. Paul's University, Limuru.
[9] Mombo has served as a visiting professor at a number of academic institutions, including Candler School of Theology at Emory University, Brite Divinity School at Texas Christian University, the Graduate Institute of Theology at Yonseo University Seoul in South Korea, and the Ethiopian Graduate School of Theology (EGEST).
[9] Mombo is a member of numerous ecumenical committees, including the World Council of Churches' Commission on Education and Ecumenical Formation, the All Africa Conference of Churches' Advisor on Education,[10] Friends World Committee for Consultation,[11] American Friends Service Committee, Gianchere High School in Kisii County, and Umoja High School in Kiambu County.
[12] She has served as a trustee of the Programme for Christian-Muslim relations in Africa, member of the Circle of Concerned African Women Theologians and the coordinator of East African region [13] installed as a Lay Canon Theologian at the Cathedral in 2017 and has served as a Lay Canon Theologian at Southwark Cathedral.
[12] She is the founder of the Tamar campaign in Kenya which acknowledges prevalence of gender-based violence in society and empower churches to address it.
[13] Mombo has received honorary Doctor of Divinity degrees from Virginia Theological Seminary (2007),[10] Church Divinity School of the Pacific (2023)[14] and her alma mater the University of Edinburgh (2023)[15] for her work of bringing to the fore issues of gender disparity and gender justice in Church and society.
"[1] Mombo is known for her research in missiology and HIV/AIDS thus her contention that in the context of HIV/AIDS and traditional rites of widow-inheritance, the church is challenged to offer more than just funeral services for the dead.
[16] The missiological challenges and opportunities she unravelled include: rethinking the relationship between gospel and culture in the era of HIV/AIDS; developing a theology and spirituality to cope with the growth of a countervailing prosperity gospel; ameliorating the root causes of poverty that lie at the heart of HIV/AIDS pandemic; and engaging in rigorous moral advocacy on behalf of those most vulnerable in the society.
To her, Women's ordination in Africa plays a vital role in helping to overcome gender inequality, poverty, violence and HIV/AIDS as 'it provides an important place for women to contribute to the wellbeing of people in society.
[17] As an African feminist theologian, Mombo propose that any theology that is going to be inclusive and global needs to interrogate the pervasive nature of patriarchy that continues to appear in church and society.
[2] Therefore, she advocated and raised her voice to building an inclusive Church where both men and women will see themselves as children of God.
Christian Interculture: Texts and Voices from Colonial and Postcolonial Worlds, 63-78.
The Singing Mysticism: Kenyan Quakerism, the Case of Gideon WH Mweresa.
Understanding World Christianity: Eastern Africa, written by Paul Kollman and Cynthia Toms Smedley.