Initially attracted to London by the "strange new subject called psychoanalysis", he met and was impressed by Wilfred Trotter, an outstanding brain surgeon who published the famous "Instincts of the Herd in Peace and War" in 1916, based on the horrors of the First World War. This was to prove an important influence on Bion's interest in group behavior. Having qualified in medicine by means of the Conjoint Diploma (MRCS England, LRCP London) in 1930 Bion spent seven years in psychotherapeutic training at the Tavistock Clinic, an experience he regarded, in retrospect, as having had some limitations. It did, however, bring him into fruitful contact with Samuel Beckett. He wanted to train in Psychoanalysis and in 1938 he began a training analysis with John Rickman, but this was brought to an end by the advent of the Second World War.