The account heralds a return to NHS-focused work for Smeeth, who before Good Relations was Brent Primary Care NHS Trust comms director.
He is working for Barnet & Chase on an initial six-month contract, advising on 'stakeholder engagement and community consultation'.
Smeeth is managing two PROs at Barnet & Chase, where former acting comms director Alison Macdonald has become board secretary.
His agency will compete for corporate, PA and 'issues-based' health work in the public and private sectors.
Smeeth was UK healthcare managing director at F-H, but left after half a year (PRWeek, 14 October).