Siv Helene Stangeland is a Norwegian architect and researcher based in Stavanger, Norway. Together with Reinhard Kropf, she founded the architectural office Helen & Hard in 1996. Siv Helene Stangeland studied at the University of Barcelona and at the Oslo School of Architecture and Design AHO, under Christian Norberg-Schulz. She has taught at AHO, NTNU (Trondheim), Chalmers University (Gothenburg) and KTH (Stockholm).

Helen & Hard has received several awards for their work, including the Norwegian National Award for Building and Environmental Design for the Pulpit Rock Mountain Lodge. They have exhibited internationally, including at the Venice Biennale, the Lisbon Biennale and Manifesta 7. In 2008, the firm was selected with 8 others to represent European architectural offices in the traveling exhibition ”New Trends of Architecture”. They have won several competitions including the Norway Pavilion at Expo Shanghai 2010 and have an extensive body of built work. H&H have written, published and lectured extensively in Europe, North America and Asia about their research on sustainable practices and methods.