Jan-Theodoor (JT) Janssen is a physicist whose research involves a wide range of topics in solid-state physics applied to metrology and materials characterisation. He established an international reputation for his work on the behaviour of electrons in nanostructured devices with the aim of developing a quantum standard for electrical current. He also made contributions to the understanding of the quantum Hall effect in graphene, and the Josephson effect.
JT is the Chief Scientist and International Director at the National Physical Laboratory and is member of the Executive team. In his role as Chief Scientist, he provides scientific leadership across a wide range of disciplines in Physics, Engineering, Chemistry, Material Science, Mathematics and Medical and Life Sciences areas.
JT is a Fellow of the Royal Academy of Engineering, the Institute of Engineering and Technology and the Institute of Physics. In 2022 JT was elected to the International Committee for Weights and Measures (CIPM) and appointed the President of the Consultative Committee for Ionising Radiation (CCRI). JT serves on the council of the UKRI Science and Technology Facilities Council (STFC) and he is a visiting professor at the University of Lancaster.
In 2023 JT received the IOP James Joule Medal for outstanding contributions to applied physics, recognising his ground-breaking work in quantum electrical metrology.
Professional position
- Chief Scientist, National Physical Laboratory
