Britain's former prime minister Gordon Brown played a key role in shaping the G20 nations' response to the world's financial crisis, and was a powerful advocate for a coordinated global response to problems such as climate change, poverty and social justice.
Emma Marris is a writer focusing on environmental science, policy and culture, with an approach that she paints as being "more interested in finding and describing solutions than delineating problems, and more interested in joy than despair."
Ian Firth designs bridges all around the world; some are very long and cross over wide rivers or sea channels, and some are really short and in the middle of towns and cities, but "all of them are unique and special in their own way."
Barcelona-based architect Xavier Vilalta works in Europe, Africa and the Middle East. He adopts and updates traditional design principles to construct modern buildings that truly suit their environment.