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Professor JT Janssen, Chief Scientist at NPL, has been elected a Fellow of the Royal Society in recognition of a career spanning a wide range of topics in solid-state physics applied to metrology and materials characterisation.
In his role as Chief Scientist, JT is responsible for the external scientific engagements with academia and other government organisations and provides scientific leadership across a wide range of disciplines in physics, engineering, chemistry, material science, mathematics and medical life sciences area.
Throughout his career, JT has 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.
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.
On being elected, JT Janssen said: “I am truly honoured to be elected to the Fellowship of the Royal Society. It is also a recognition of the exceptional metrology research NPL undertakes, and I would like to thank the many colleagues and collaborators I have had the pleasure of working with throughout my career.”
Sir Paul Nurse, President of the Royal Society, said: “I am delighted to welcome this newest group of exceptional scientists to the Fellowship of the Royal Society.
Their contributions reflect the highest standards of scientific endeavour. Whether advancing our understanding of vaccines or exploring the transformative potential of mathematics and computation, their work exemplifies the enduring value of curiosity, creativity and rigorous inquiry.
Our Fellowship is strengthened not only by individual distinction, but by the diversity of perspectives and experiences its members bring. This incoming cohort highlights the truly international character of contemporary science and underscores the vital role that plays in achieving breakthroughs that benefit us all.”
Exceptional scientists elected as Fellows of the Royal Society | Royal Society
27 May 2026