Tanja Malycheva is an independent researcher. She served as an assistant curator at the Museen Böttcherstrasse, Bremen where she was involved in organizing the exhibitions Me. Myself. Naked. (2013) and Marianne Werefkin: From the Blue Rider to the Great Bear (2014). Currently, she works on Valentin Serov's portraiture in a pan-European context.

Isabel Wünsche, Ph.D. (1997), Heidelberg University, is Professor of Art and Art History at Jacobs University, Bremen. Her book publications include Galka E. Scheyer & The Blue Four: Correspondence, 1924-1945 (2006), Biocentrism and Modernism (2011), Meanings of Abstract Art: Between Nature and Theory (2012), and The Organic School of the Russian Avant-Garde: Nature's Creative Principles (2015).