Being a part of Capital Cities Project she developed her interest in the political aspects of the architectural form and the city. She collaborated on Brussels a Manifesto: Towards the Capital of Europe (published by tge NAI). Siemionow was awarded several prizes in international architectural competitions. In her career she has collaborated with various young notable architects from Belgium, Italy, Israel, Switzerland and the Netherland, and the U.S. Currently she teaches as an assistant professor at IIT College of Architecture.