Professor Ian Chapman will be new CEO of the UK Atomic Energy Authority (UKAEA).
He has been appointed by Universities and Science Minister Jo Johnson and will take over from current CEO Steve Cowley on 1st October.
The group researches atomic energy science and technology with the aim of advancing commercialisation and helps to globally develop nuclear fusion as a future source of clean energy.
Professor Chapman is one of the youngest CEOs of a major research centre, at 34 years old.
He said: “Whilst I am young, I am also experienced. I hope my profile means that fusion and its huge potential to give the world cleaner energy will get noticed.
“Furthermore, I hope my appointment will inspire the next generation of scientists and engineers to make a success of ITER, the international fusion project which in my opinion is the most important experiment mankind has ever done.”