Nancy Duarte is the CEO of Duarte Design, the largest design firm focused solely on presentations, whether they are delivered in person, online, or via devices. For more than 20 years she has shaped the perception of the world's leading brands. She is a TED Fellows committee member and a TED Conference partner. Her firm worked with Al Gore to develop the presentation that became the Academy Award-winning documentary An Inconvenient Truth. In 2008 she authored slide:ology: The Art and Science of Creating Great Presentations, where her experience was distilled into best practices for visual business communicators.