Stringer has already hired Exposure senior account manager Faye Neighbour and Freud account director Emma Pontefract to staff the agency, which is called Pretty Green.
The new shop will offer traditional brand comms including PR, events and experiential support.
It will also target new business and start-up companies using a 'brand incubator' facility, which aims to help them develop and define their brand before taking it to market.
'Start-up businesses are often exceptionally exciting and interesting,' said Stringer. 'But they desperately need leading commercial marketing expertise and knowledge to help launch and grow their brands. They cannot afford the fees of the top tier agencies.'
Stringer has already secured a project for Red Bull.
He left Exposure in February this year after ten years following a split with the board (PRWeek, 28 February).
The agency asked him to leave following talks about his future.
He had debated leaving the agency at the end of 2008 but talks resulted in an acrimonious split.