Dr John Cohn (@johncohnvt) is a self-confessed nerd. He already knew he wanted to be an engineer at the age of eight, found himself a nerdy college, a nerdy job and even a nerdy wife, or at least a fellow-engineer. As a nerd he breaks the mould though. Because onstage, with his rainbow-coloured lab coat, his Einstein-inspired hairdo and his party light headband, he is most of all entertaining and fun. That ties in with his motto: keep things playful. Bring a playful spirit into your work.