Krystal Sutherland (Author) Krystal Sutherland is the New York Times and indie bestselling author of House of Hollow, A Semi-Definitive List of Worst Nightmares and Our Chemical Hearts, which was adapted into a film by Amazon Studios. Her books have been published in more than twenty countries and nominated for the Carnegie Medal and YA Book Prize, among others. Originally from Australia, she has lived on four continents and currently calls London home. Martin Serenviratne (Author) By day, Martin is a doctor and AI scientist. He trained in medicine in Australia, studied AI at Stanford, and worked at Google. But at his core, Martin is a storyteller, having grown up with the rich mythology of his Sri Lankan family. He loves to imagine how technology can power new futures (and pasts). Martin is married to bestselling author Krystal Sutherland. On a visit to Sigirya, the ancient rock fortress in the heart of Sri Lanka's jungles, they began to craft their debut middle-grade series, Time Lions. The story of the genius Amarasinghe twins and their adventure back through time, it explores overlooked parts of history and the overlooked geniuses who shape it.