Taking on the ad world from India

Naveen Tewari, the chief executive of InMobi, on how he started the third-largest firm in the fast-growing mobile advertising industry.

The company, based in Bangalore, India, has 24 offices in 17 countries and employs more than 900 people. Last year it posted 720 billion mobile adverts on the phones of more than 1 billion users.

In just a few years he hopes they will send adverts to two and a half billion people everyday.