Building billion dollar companies

Dr David Cleevely knows a thing or two about building businesses. A serial entrepreneur and investor, he has worked at the heart of the Cambridge Cluster on numerous ventures including telecoms consultancy Analysys, web based antibody company Abcam (ABC.L); and G femto base station company, 3WayNetworks. Abcam, which he co-founded in 1998 and was Chairman of until 2009, currently has a $1.5bn valuation - not bad for a company that starting selling antibodies door-to-door on a bike! David tells the Abcam story and looks at other billion dollar companies that have come out of Cambridge.