Gemma was the former content director of Live Science, Space.com, science and space magazines How It Works and All About Space, history magazines All About History and History of War. She is the author of several books including "Quantum Physics in Minutes", "Haynes Owners’ Workshop Manual to the Large Hadron Collider" and "Haynes Owners’ Workshop Manual to the Milky Way". She holds a degree in physical sciences, a master’s in astrophysics and a PhD in computational astrophysics.