Samuels is next month due to leave the NCAA, set up last April in the wake of the Dr Harold Shipman trial, who was convicted of killing 15 of his patients but who is thought to have killed up to 350.
He is joining Barnet and Chase Farm Hospitals NHS Trust as its first director of communications - and first in-house PRO.
NCAA is now on the hunt for Samuel's successor to head all internal and external comms, reporting to CEO Alastair Scotland.
The role, which sits on the executive management team, includes responsibility for a team of three, but Samuels said there may be room for recruitment to match the growth of the NCAA.
'The authority has an exciting agenda ahead of it in raising public confidence in the quality of doctors,' said Samuels.