Mike Penrose is stepping down as the executive director of Unicef UK.
Penrose has led the organisation since April 2016 and is moving on to pursue 'a number of personal projects' when he leaves the organisation in the Autumn.
Unicef is set to start recruiting for a new leader immediately.
“The trustees of Unicef UK would like to thank Mike for his leadership and service over recent years. Mike has had a distinguished career in humanitarian work and during his time at Unicef has been a fierce and effective advocate of children’s rights. We wish him well for the future," the board's chair, Douglas Alexander said.
Penrose added: “It has been a tremendous honour to serve as the executive director of such an amazing organisation with such passionate staff.
"Unicef UK is a dynamic and inspiring organisation and the commitment of all its employees to champion children’s rights never ceases to amaze me. I feel very proud of the work that has been achieved for children both here in the UK and around the world.”