 Dentsu bought Aegis in 2012 and formed Dentsu Aegis Network, which is headquartered in London and operates in 145 countries worldwide with around 45,000 employees.Dentsu Aegis Network is made up of 10 global network brands—Carat, Dentsu, Dentsu media, iProspect, Isobar, Accordant, mcgarrybowen, Merkle, Fountainhead MKTG, Posterscope and Vizeum and supported by its specialist/multi-market brands.Dentsu was originally established as and by Hoshiro Mitsunaga.