The London region is governed by the mayor of London and the London Assembly. London is one of the world’s most important global cities. It exerts considerable influence on the arts, commerce, education, entertainment, fashion, finance, healthcare, media, professional services, research and development, tourism, and transportation. It is one of the largest financial centres in the world and in 2019, London had the second highest number of ultra high-net-worth individuals in Europe, after Paris. And in 2020, London had the second-highest number of billionaires of any city in Europe, after Moscow.