Q who coined the term 'brain drain'?

Human capital flight, sometimes also called brain drain, refers to the emigration of intelligent, well-educated individuals to somewhere for better pay or conditions, causing the place they came from to lose those skilled people, or "brains." Typically, emigrating brains have learned English and have moved to the United Kingdom, the US or some other English-speaking country. An example is Albert Einstein. Brain drain is common in developing nations, particularly in former African colonies of the United Kingdom, the island nations of the Caribbean, and in centralized economies such as the former East Germany and the Soviet Union. China and India have recently been discovered to be at the top of the list of countries with skilled students of English leave