The East of England Ambulance Trust has said chair Maria Ball has resigned.
The Trust says its focus is now solely on improving the service to patients and better support our staff.
Vice-chair Paul Remington said: "We are developing a transformational plan, details of which will be published next week. This will involve recruiting many more front line staff, better managing sickness absence, clearer career pathways and a renewed focus on patient handover delays."
More top news
The family of a teenager who was stabbed to death as he walked home from college in Chelmsford say they are inconsolable.
Dry and chilly overnight. Winds strengthening Sunday and becoming milder.
Dry with some sunshine but a cold wind.