About the author:

Tony O’Sullivan is a Cardiff astrophysicist, science communicator and performer, known to audiences across Wales as The Bearded Scientist.

He left school believing science was not for him, and worked as a stonemason into his thirties before returning to education at 33. He is now a PhD researcher at Cardiff University’s School of Physics and Astronomy, where his work runs along two strands: the outbursting comet 29P/SchwassmannWachmann 1, and a longitudinal study of science capital among young people aged 8 to 18 across Cardiff and Gwent.

His findings inform the Curriculum for Wales, and he is working with the Institute of Physics Wales and STEM Learning to develop the first national benchmark for science capital in Wales.

He is Director of Nova Outreach Ltd, named Start-up of the Year at the 2026 Wales STEM Awards, which has reached more than 4,000 children, families and adults across eight Welsh local authorities in 2026 alone.

In 2026, he won FameLab UK at the Cheltenham Science Festival.

About the illustrator:

Nathan Chitsiga is a Cardiff artist, illustrator, rapper and dancer, who works under the name Galaxy Sega.

Entirely self-taught, he works across all media, physical and digital, and has built a distinctive style of his own. His art has been shown in galleries, and he takes commissions alongside his music and dance.

He illustrates the Bearded Scientist books, bringing the character and his adventures to life.