Drayton has spent the past ten months as the managing director of Advertising.com's European operation. His exit is the result of a change in strategy at the company's parent, Time Warner AOL, which sees the European operation become more closely aligned with the US group.
Drayton leaves without a job to go to. In a statement, he said he has no immediate career plan.
Drayton said:"It has been a hugely enjoyable year for me, working with very bright, talented teams in a dynamic industry. A short-term consolidation task was required after the company's acquisition by AOL in late 2004. Advertising.com is now set for a bright future in Europe. I wish my colleagues across the European Union markets success."
Drayton joined the company, which has European offices in the UK, Denmark, France, Germany, Norway, Spain and Sweden, in June 2005.
Drayton left the Telegraph Group shortly after the Barclay brothers acquired it in 2004. Before that, he was the Hollinger Telegraph New Media managing director, where he was responsible for developing the Telegraph brand online.