Jon Mendlesohn is director of Election Resources for Gordon Brown. A former lobbyist with New Labour shop LLM, adviser to Tony Blair and the former treasurer of Labour Friends of Israel, he is very well connected in New Labour and zionist circles.
Mendelsohn advised Tony Blair on business relations from 1995-7. He used to handle Blair's business links and retains close links with Jonathon Powell, the chief-of-staff at 10 Downing Street and Lord Levy.
With Neal Lawson and Ben Lucas he formed LLM. All three used to work at the consultancy firm Lowe Bell, founded by Sir Tim Bell (Margaret thatcher's favourite PR man). They were loaned to the Labour Party during the 1997 election.