Calleb holds a Bachelor of Commerce (Finance option) from the University of Nairobi, is a Certified Public Accountant of Kenya (CPA-K), and is currently pursuing a Master of Science in Business Administration at the University of Salford. He brings over ten years of progressive, comprehensive experience across accountancy, corporate finance, and strategic grants management. Having served in key capacities including Financial and Grants Accountant at Seed Systems Development, Principal Consultant at Caden Consulting Group, Audit Associate at Lobonyo and Associates, and Hospital Accountant at Oasis Doctors Siaya, he possesses deep expertise in financial governance and regulatory compliance.Calleb is highly specialized in complex, donor-funded financial ecosystems, commanding a proven track record managing programs funded by premier international development partners such as USAID, IFAD, AfDB, WFP, the World Bank, the Bill & Melinda Gates Foundation, and the Rockefeller Foundation. At UjuziNest, he steers the financial frameworks and compliance controls, ensuring robust capacity-building, strategic resource allocation, and strict multi-donor alignment to safeguard long-term grassroots impacts.