Mary works at the Centre for Mathematics, Science and Technology Education in Africa (CEMASTEA) as the head of Partnerships & Linkages Department and Senior Teacher Trainer, Mathematics Education. She has extensive experience as a Mathematics Education expert with close to twenty years training teachers from Kenya and other African countries. She has presented papers and given advocacy talks in local and international conferences and workshops in areas of mathematics and science education. 

Mary is a member of the executive committee of the Strengthening of Mathematics and Science Education in Africa (SMASE-Africa) a continental platform for educators and implementers that focus on addressing challenges in mathematics and science education. She holds a ministerial appointment as the coordinator of ADEA’s Inter-Country Quality Node on Mathematics and Science Education (ICQN-MSE) that spearheads policy dialogue in this thematic area. She is a member of the coordinating team of the African Union Commission’s Continental Education Strategy for Africa (CESA 2016-25) thematic cluster on Science, Technology, Engineering and Mathematics (STEM) Education in Africa. She successfully coordinated the implementation of continental STEM education programs since 2005 funded by various partners such as: Teacher training by JICA; Gender-Responsive STEM education by UNESCO-Paris, Education Development Trust, FAWE, Institute for International Education (IIE), AU-CIEFFA, and the US Mission to UNESCO-Paris.