The Stratospheric and Tropospheric REsearch And Modeling (STREAM) group is a research team at Universidad Complutense de Madrid devoted to the analysis and modeling of the atmospheric circulation and climate variability. Currently, the group has about ten members, including permanent staff, post-doctoral and PhD students, with an intense international activity and a dense network of collaborations. We have more than 10 years' experience in the field. The research activity of STREAM is organized around four main topics: climate reconstruction in the last 500 years, tropospheric climate variability, dynamics of the middle atmosphere and extreme events. Further information can be found at http://stream-ucm.es.