Geoff Blackwell is an award-winning publisher, author, photographer and filmmaker. He has created numerous internationally bestselling books founded on humanity, equality and the environment, which have been published in forty languages.

He has worked alongside many internationally renowned photographers, authors and organisations, most notably Nelson Mandela and the Nelson Mandela Foundation, with whom he created five books. He has also conceived a number of multimedia projects that have given rise to books, films and touring exhibitions, including 200 Women: Who Will Change the Way You See the World, Wisdom and M.I.L.K. (Moments of Intimacy, Laughter & Kinship).

His most recent project, I know this to be true, was conceived in collaboration with the Nelson Mandela Foundation and is based on his original interviews with and photography of some of the most inspiring leaders of our time to record and share what really matters to them. He is co-founder of Blackwell & Ruth, and the founder of M.I.L.K. Tailor Made Books.

Greta Thunberg is a climate crisis activist from Sweden. In August 2018, she decided not to go to school one day, starting a strike outside the Swedish Parliament. Her actions sparked a global movement to fight the climate crisis, inspiring millions of students to go on strike for our planet.

Greta has Asperger's and considers it a gift which has enabled her to see the climate crisis in "black and white." She has won the prestigious Prix Liberte, has been nominated for a Nobel Peace Prize, and was selected as Time's Person of the Year in 2019. She is the author of the bestseller No One Is Too Small to Make a Difference.