No Better Time tells of a young, driven mathematical genius who wrote a set of algorithms that would create a faster, better Internet. It's the story of a beautiful friendship between a loud, irreverent student and his soft-spoken MIT professor, of a husband and father who spent years struggling to make ends meet only to become a billionaire almost overnight with the success of Akamai Technologies, the Internet content delivery network he cofounded with his mentor.

Danny Lewin's brilliant but brief life is largely unknown because, until now, those closest to him have guarded their...