Jimmy Carter

President Carter has been out of office for 34 years and counting. He is renowned for his work with Habitat for Humanity, and his foundation, the Carter Center, has done extraordinary work promoting democracy, human rights and global health. Of particular note is the foundation’s effort to eradicate the Guinea worm, which has helped lead to infections dropping from 3.5 million in 1986, when the foundation began combating the problem, to around 100 in 2014. Critics, however, allege the foundation gave its approval to questionable election processes in Venezuela in 2004.