Zeynu served as a diplomat in Ethiopia and Kenya for more than 10 years. As a senior diplomat with the Ethiopian Embassy in Nairobi, Kenya,[5] he managed bilateral level and multilateral cooperation on issues of conflict resolution, regional economic integration, political issues, counter terrorism and other transnational crime prevention for the government of Ethiopia.
On 25 June 2018, he was the Commissioner General of Ethiopian Federal Police and managed a critical period in Ethiopia's transition from a repressive regime to democracy.[6] He was responsible for handling transition related chaotic situations, leading Ethiopia's efforts to enforce the rule of law and prevent organized national and trans-border crimes. His tenure saw the initiation of several police reform programs in Ethiopia. Between October 2018 and November 2019, he served as State Minister of Peace, where he was in charge of developing strategies and coordinating national efforts to enforce the rule of law, manage conflicts, and build peace in Ethiopia.[7][8]
A veteran in Ethiopia's public service, Zeynu served as deputy director of the Administration for Refugee and Returnee Affairs (ARRA)[9] with responsibility for leading one of the world's largest refugee operations, hosting over a million refugees originating from over 20 countries in Africa and the Middle East with an annual budget of over 50 million US dollars and over 3500 staff.[10] The current refugee law in Ethiopia is one of the best refugee law in the world, and this is the contribution of Zeynu Ummer, who drafted the law and convinced the parliament to approve it. He also led the design of a 10-year strategy on self-reliance of refugees and uplifting socio-economic situation of refugees.
Zeynu Ummer joined UNDP in 2019 to design and launch the Africa Borderlands Centre in close consultation with the African Union, regional economic communities in Africa, development partners, UNDP country offices and other UN agencies.[11][12] In May 2024, he was appointed Director of the UNDP Resilience Hub for Africa based in Nairobi Kenya. As of 2025, his net worth is estimated to be US$15.5 Million