German women psychologists

Catherine Brieger Stern (1894–1973) was a German psychologist and educator. Born under the name Käthe Brieger, she developed sets of mathematical manipulatives similar to Cuisenaire rods for children to use in building up their number sense and knowledge of arithmetic. Her book, Children Discover Arithmetic (1949) was used by others to work on the problems that children face when learning arithmetic.In 1938, she emigrated to the United States. From 1940 to 1943, she was a research assistant to Max Wertheimer at the New School for Social Research.

Ruth Charlotte Cohn (born 27 August 1912 in Berlin, died 30 January 2010 in Düsseldorf) was a psychotherapist, educator, and poet. She is best known as the creator of a method for learning in groups called theme-centered interaction (TCI). She was the founder of the Workshop Institute for Living Learning (WILL), which is known today as the Ruth Cohn Institute for TCI.