He was wearing a grey bomber-style jacket with black lining and hood, light blue bleached jeans that were ripped at the bottom and grey hi-top trainers when he went missing.

BBC: Mother makes plea over missing son Ross Ramsay

But thanks to Mr Seifert's quick switch to electronic trading and a push to create new markets for smaller firms, Frankfurt now boasts the world's biggest derivatives exchange, Europe's busiest market for hi-tech firms, and a pivotal role in shaping the trading and clearing of Europe's blue-chip shares.

ECONOMIST: Frankfurt��s impatient maestro