sentences:  The online advertising model of Pay-Per-Click advertising which Luke pioneered in 2000 has driven much of the growth in the online advertising market, and in 2003 both Google (with their AdWords programme) and Yahoo!subsequently followed Espotting into the UK market.One of the youngest presidents of a NASDAQ listed company (appointed to the role at the age of 31), Bishop began working in advertising at the age of 14 at Yellowhammer during his summer holidays and at 19 joined Publicis as an art director.