Age: 48
Occupation: Administrator of the Environmental Protection Agency
Previous TIME 100 Appearances: 0
Adopted just a few weeks after birth, Jackson spent 16 years with the EPA before becoming head of the New Jersey Department of Environmental Protection and later chief of staff to then Governor Jon Corzine. She's the first African-American head of the EPA, and beyond pushing for regulation on climate change, Jackson has brought a passion for environmental justice to the job, forged by her New Orleans upbringing.