He describes himself as an 'experienced buffalo wings eater' - a man so sports mad he built a sports bar in his basement he calls HelmetHeads, and part-bought his local hockey team. His co-workers describe him as an unassuming and friendly boss, whose easygoing demeanor is belied by high professional expectations. To the rest of the world, he is now only one thing: the soon-to-be CEO of Amazon. When Jeff Bezos announced he was retiring, he announced Andy Jassy was replacing him, Amazon observers were not surprised. Bezos, 57, described his replacement as an Amazon stalwart; business insiders said his appointment was all-but secured when Bezos's other deputy, Jeff Wilke, who ran Amazon's retail business, announced in August that he was retiring. Jassy's current role is head of AWS, which he has helped build from the ground up since 2003, and now generates over $40 billion in annual revenue, and is responsible for over 60 per cent of Amazon's operating profits, though its sales are just 13 per cent of the total.