 From 2002 until 2006 Temesgen worked on his PhD at UNESCO-IHE and at the department of Water Resources of the TU Delft, Netherlands.After the completion of his PhD, he taught at Addis Ababa Institute of Technology and was assistant professor at the School of Civil and Environmental Engineering at Addis Ababa University.Temesgen then founded his own company "Aybar Engineering" in Addis Ababa.