The Seventy Seven brand, part of the Fishburn Hedges Group, will continue under new leadership after the three senior departures.
Seven Seven MD James Gordon-MacIntosh and creative director Carr are to leave the Fishburn Hedges Group to establish a new consumer PR agency.
Twigg is also leaving the agency to pursue his own food and drink-based comms consultancy, but will remain part of the Fishburn group and will continue to collaborate with Seventy Seven.
The changes are part of a management overhaul at the wider Fishburn Hedges Group, which sees Simon Matthews step into the role of executive chairman of Fishburn Hedges alongside his role as group chief executive.
Fiona Thorne, currently MD, becomes chief executive of Fishburn Hedges and Suzanne Morris is promoted to become MD of Fishburn Hedges.
Meanwhile, John Williams, one of the original founders of Fishburn Hedges and a long-time adviser, also rejoins on a permanent basis as group director of strategic planning, working with the agencies across the group.
Matthews, who will lead the search for a new MD and creative director for Seventy Seven, commented: ‘I'm sorry to see James, Jo and Alan depart but we wish them well in their separate ventures. However, supported by the wider group, we will be working with the talented team within Seventy Seven, its great clients and new leadership to take the business to the next chapter in its development.’
He added: ‘Today's announcement brings the deserved promotions of Fiona and Suzanne within Fishburn Hedges and the addition of John Williams, one of the best strategic brains in the business.’