In 2015, there was an 85 percent decrease in polio cases in Pakistan, and Seth Berkley, CEO of the Gavi vaccine alliance and former president of the International AIDS Vaccine Initiative, isn’t stopping there. An outspoken opponent of the anti-vaxxer movement, Berkley and Gavi have been instrumental in introducing vaccines for polio, pneumonia, diarrhea, cervical cancer and cholera, virtually ridding Africa of meningitis A. Seth brings the fight to social media, tweeting infographics, statistics, and links to relevant charities. His popular TED Talk argued for a change in mindset and pace when it comes to making new, vital vaccines to protect us all.