Achenyo Idachaba is the head of MitiMeth, a Nigeria-based company that makes handicrafts from aquatic weeds and other agro-waste.

Will MacAskill is a cofounder of the effective altruism movement, a philosophy that tries to answer the question: How can we do as much good as possible?

Mitch Zeller leads the US Food and Drug Administration's efforts to reduce disease and death from tobacco use and bring previously unavailable information about its dangers to light.