Atkin said the business would cover the areas she worked in at First&42nd: namely CSR, risk management, organisational effectiveness and corporate brand development.
She will report to Tulchan founder Andrew Grant, who said: 'Companies are doing more work in general internally but there is still a role for strong strategic advice to directors of corporate communications.'
'First&42nd was the first communications consultancy that truly operated in the area of management consultancy. With Jane's experience and background, that work is only going to become more important and relevant to those directors.'
First&42nd was bought by Edelman in 2002.
In her current role, Atkin's major clients include Orange, Allied Domecq and Unilever.
'Tulchan has fantastic access to very senior clients,' said Atkin. 'I see this as a real opportunity to leverage its client contacts and my experience. The challenge is how to do that.'
Grant said the service would probably be offered under the Tulchan brand rather than a separate name, and would look to have a team of six.
Atkin is on six months' notice at First&42nd and will join Tulchan once the terms of her departure have been hammered out.
Edelman president and CEO David Brain, to whom Atkin currently reports, said a headhunter had been commissioned to seek her replacement externally.
If there is any gap between Atkin's departure and her replacement joining First&42nd, Brain said he would handle Atkin's clients in the interim.