Curtain is a former City editor of Business AM, spent 14 years as a business journalist before moving into PR. Before Capital MS&L he held positions at Abchurch Communications and Bankside.
He has launched the agency with the hire of a former Bloomberg journalist.
Jennifer Thomas, formerly vice president and director of Washington DC-based comms firm The Harbour Group, will advise on communications strategy, media relations and crisis management.
The agency already boasts form MS&L client, technology firm NXT on its roster.