Over the past six years, Gerry Cottle Jr has built up a $6m (£4.4m) a year business, showing films on the city rooftops. He was born into a famous circus, and while he left the business he puts down his success to watching how his father promoted his circus.Video journalist: Jeremy HowellFollow #CEOSecrets on our website here.
Source: BBC News
'Shout it from the rooftops, promote your idea'
