Horizon Nuclear Power has made former Magnox Site Director Greg Evans its new Operations Director for Wylfa Newydd.
Wylfa Newydd is the site where a new nuclear power station is set to be built.
The proposed site is on land beside the existing operational Magnox nuclear power plant.
Mr Evans will take overall responsibility for developing Horizon and liaising with local organisations, as well as key groups across the region.
Mr Evans said: “Nuclear power has played a vital role in supplying the UK with secure, low-carbon electricity since the 1950s and this new development will help ensure it does so for another 60 or more years.”