Yoma is Oxfam GB's global advisor for accountability to partners and beneficiaries. Currently, she is developing the internal environment of Oxfam in which greater accountability can be achieved; working on very practical tools for all staff to understand, promote, and practice greater accountability; developing global indicators for accountability and capacity building with partner organisations; and engaging with other organisations to ensure that Oxfam is constantly learning, as well as sharing learning with others.

She has previously worked in both development and humanitarian programmes in Southern, Central, and West Africa. During her Oxfam and UN OCHA posts, she has managed or supported responses in Rwanda, Burundi, Tanzania, Liberia, Guinea, and throughout DRC. As the humanitarian coordinator for South and East Asia, she coordinated Oxfam's responses to post 9/11 relief work in Afghanistan and Pakistan, and to major drought, flood, and cyclone response programmes in India, Indonesia, Sri Lanka, Bangladesh, Nepal, the Philippines, and Viet Nam, and advised on Oxfam's response to the 2004 tsunami.

Whilst working with Oxfam's humanitarian department, Yoma developed an interest and expertise in the Prevention of Sexual Exploitation and Abuse (PSEA) in development organisations, and spearheaded Oxfam's work on this for five years. These experiences led her to her current post and passion for increasing organisational accountability to the partners and communities with whom aid agencies work.