As co-creator of Siri, Tom Gruber helped redefine the role of machine intelligence in our lives and transformed the way we interact with our devices.

Eduardo Briceño is a learner, leader, speaker and writer devoted to enabling a more learning-oriented world.

As a high school chemistry teacher, Ramsey Musallam expands curiosity in the classroom through multimedia and new technology.

Peter Doolittle is striving to understand the processes of human learning.

Ramona Pierson develops tools to revolutionize learning management and assessment systems -- her fourth career after aviation, neuropsychology and software development.

At the Afghan Institute of Learning, Sakena Yacoobi provides teacher training to Afghan women, supporting education for girls and boys throughout the country.

César Hidalgo studies how teams, cities and nations learn.

Chloé Valdary developed "The Theory of Enchantment," a social emotional learning (SEL) program that helps educators transform their students' lives.

Anthony Goldbloom crowdsources solutions to difficult problems using machine learning.

Michael Bodekaer is a serial entrepreneur with a passion for building innovative technology companies that have the potential to change the world.

Dina Zielinski brings biological data to life, from decoding mutations in cancer to encoding data in DNA.

LeeAnn Renninger is the founder of LifeLabs Learning, a company that trains managers and teams at innovative companies around the globe. Her specialty is in rapid skill acquisition -- the fastest way to learn a skill that matters most.

Russ Altman uses machine learning to better understand adverse effects of medication.

Liz Coleman radically remade Bennington College in the mid-1990s, in pursuit of a new vision: higher education as a performing art.

Diane Wolk-Rogers has been a Florida public school teacher for more than three decades.

Yann LeCun is chief AI scientist at Facebook and Silver Professor at New York University.

Karim Abouelnaga is working to provide kids with access to high-quality academic summer programming.

Tania Luna is the co-CEO of LifeLabs Learning and co-host of the podcast "Talk Psych to Me."

Michael Merzenich studies neuroplasticity -- the brain's powerful ability to change itself and adapt -- and ways we might make use of that plasticity to heal injured brains and enhance the skills in healthy ones.

Educational researcher Sugata Mitra is the winner of the 2013 TED Prize. His wish: Build a School in the Cloud, where children can explore and learn from one another.

Jeremy Howard imagines how advanced machine learning can improve our lives.

TED Fellow Pratik Shah creates novel intersections between engineering, medical imaging, machine learning and medicine.

Developmental behavior studies spearheaded by Laura Schulz are changing our notions of how children learn.

As the head of a student group called Uncomfortable Learning, Zachary R. Wood made a point of engaging in conversation with people he disagreed with.

Sanjit “Bunker” Roy is the founder of Barefoot College, which helps rural communities becomes self-sufficient.

Olympia Della Flora wants schools to think differently about educating students -- by helping them manage their emotions.

Kenneth Cukier is the Data Editor of The Economist. From 2007 to 2012 he was the Tokyo correspondent, and before that, the paper’s technology correspondent in London, where his work focused on innovation, intellectual property and Internet governance. Kenneth is also the co-author of Big Data: A Revolution That Will Transform How We Live, Work, and Think with Viktor Mayer-Schönberger in 2013, which was a New York Times Bestseller and translated into 16 languages.

As Director of Stanford’s Artificial Intelligence Lab and Vision Lab, Fei-Fei Li is working to solve AI’s trickiest problems -- including image recognition, learning and language processing.

Mehdi Ordikhani-Seyedlar is a machine learning engineer using data mining techniques on large-scale data.

With Coursera, Daphne Koller and co-founder Andrew Ng are bringing courses from top colleges online, free, for anyone who wants to take them.