Kelvin was just six when the notoriously violent civil war in his country of Sierra Leone officially ended, and despite his young age and lack of traditional engineering education, he quickly became one of the country’s leading technological inventors. When he was 11, he looked through garbage for scrap electronics that could help fix local problems. At 13, he started making his own batteries by wrapping acid, soda and metal in a tin cup with tape to help power lights in people’s homes. He built a generator out of homemade or rescued spare parts for his community, and used it to power a community radio station that he also built from recycled materials. He became the station’s DJ Focus, and his friends became the journalists and station managers. "They call me DJ Focus because I believe if you focus, you can do an invention perfectly," Doe said in a video. In 2012, when he was 15, Doe became the youngest ever “visiting practitioner” with the MIT International Development Initiative, where he had the chance to present his inventions to MIT students, took part in research, and even taught engineering students at Harvard. His mentor, David Sengeh, a PhD student at the MIT media lab, said: "In Sierra Leone, other young people suddenly feel they can be like Kelvin." In 2016, Doe became an Honorary Board member of EMERGENCY USA, which works to provide medical and surgical care to the victims of war and poverty.