Afghanistan's president Ashraf Ghani has initiated sweeping economic, trade, social and peace reforms.

Anas Aremeyaw Anas is a Ghanaian undercover journalist and private eye who gathers hard evidence of crime and corruption, putting the perpetrators behind bars.

Jarreth Merz' new film, "An African Election," follows the 2008 presidential elections in Ghana from start to finish.

Apiorkor Seyiram Ashong-Abbey is a Ghanaian poet, writer, literary critic, media practitioner, activist and versatile creative of Ga-Daŋme and Ewe ancestry.

As president and COO of SpaceX, Gwynne Shotwell is responsible for day-to-day operations and for managing all customer and strategic relations.

In articles that span the gene-editing abilities of CRISPR, the roots of psychopathic behavior in children, and much more, Jennifer Kahn weaves gripping stories from unlikely sources.

Tim Guinee is a passionate advocate for creating a more sustainable world.

Sophia Kianni is a United Nations climate advisor and the founder of Climate Cardinals, a nonprofit that aims to make climate resources more accessible to people who don't speak English.

Ken Jennings holds the record for most consecutive wins on the classic American trivia game show, Jeopardy.

After working at Microsoft for almost a decade, Patrick Awuah returned home to Ghana and cofounded Ashesi University, a small liberal arts college that aims to educate Africa's next generation of leaders. Its first class of students graduated in 2006.

DK Osseo-Asare creates architecture with and for the people that design overlooks.

Nathaniel Kahn is an Oscar- and Emmy-nominated maker of documentary films. His journey to understand his distant father -- the legendary modern architect Louis Kahn -- became the film "My Architect."

TED Fellow Jane Chen has spent years working on health issues in the developing world.

Sally Kohn searches for common ground among political foes by focusing on the compassion and humanity in everyone.

Emily Quinn describes herself as "a ballsy intersex activist who uses humor and storytelling to create a more welcoming world for people who don’t fit in a box."

Ken Kamler has served as doctor on some of the world’s most daring expeditions, but also performs delicate microsurgery when at home in New York.

Ken Chenault invests in fast-growing companies that have the potential to become large, fundamental institutions.

Aziza Chaouni focuses on projects that integrate architecture and landscape, and that ultimately give back to their communities. For years, she has worked to revive the Fez River, which runs through her hometown of Fez, Morocco.

Keith Chen's research suggests that the language you speak may impact the way you think about your future.

Chen Qiufan (aka Stanley Chan) is an award-winning author, translator and curator. He is the co-author of the new book "AI 2041: Ten Visions for Our Future" and was selected as a culture leader by the World Economic Forum in 2019.

With her viral talk from TED2012 and her mega-bestseller "Quiet," Susan Cain urged society to cultivate space for the undervalued, indispensable introverts among us. Now, with her new bestseller "Bittersweet," she's back to explore the surprising lessons sorrow and longing teach us about creativity, connection and love.

Mike Kinney helps people reach their full potential.

Ken Goldberg works reflect the intersection of robotics, social media, and art.

TED Fellow Kiana Hayeri is a visual storyteller.

Engaging scientific knowledge, Nancy N. Chen examines the intersections of medicine, political economy and social inequality.

In her writings, Taiye Selasi explores our relationship to our multiple identities.

TED Fellow Albert Fox Cahn is an anti-surveillance advocate.

Jason W. Chin pioneers methods to reprogram the genetic code of living organisms.

Sangu Delle is an entrepreneur and clean water activist. A TED Fellow who hails from Ghana, he sees incredible potential in the African economy.

Creativity expert Sir Ken Robinson challenged the way we educate our children, championing a radical rethink of how our school systems cultivate creativity and acknowledge multiple types of intelligence.