On the eve of the Nazi invasion of France in 1940, Feldenkrais fled to Britain with a jar of heavy water and a sheaf of research material, with instructions to deliver them to the British Admiralty War Office.In 1954, after directing the Israel Defense Forces (IDF) Department of Electronics for several years, he settled in Tel Aviv and began to teach his method full-time.[3] He also became the personal trainer of David Ben-Gurion, the Prime Minister of Israel, whom he taught to stand on his head in a yoga pose.[8][9] Throughout the 1960s, 1970s and in 1980 he presented his method in Europe and in North America (including an Awareness Through Movement program for human potential trainers at Esalen Institute in 1972).Over the course of four summers, from 1975 to 1978, he trained 65 teachers in San Francisco at Lone Mountain College under the auspices of the Humanistic Psychology Institute.The Feldenkrais Method is intended to teach better movement and improve quality of life, by means of instruction and gentle manipulation of the body.