Kurt Koffka
Koffka was born and educated in Berlin and earned his PhD there in 1909 as a student of Carl Stumpf. Koffka also spent one year at the University of Edinburgh in Scotland where learnt English, a skill that later served him well. Koffka worked at the University of Frankfurt when Max Wertheimer arrived in 1910 and invited Koffka to take part as a subject in his research on the phi phenomenon.