These autobiographical memoirs of Neal Koblitz, coinventor of one of the two most popular forms of encryption and digital signature, cover many topics besides his own personal career in mathematics and cryptography - travels to the Soviet Union, Latin America, Vietnam and elsewhere, political activism, and academic controversies relating to math education, the C. P. Snow two-culture problem, and mistreatment of women in academia. The stories speak for themselves and reflect the experiences of a student and later a scientist caught up in the tumultuous events of his generation.
Koblitz is a great writer, and his life is incredibly interesting. He talks some about math and his contributions to cryptography, but it's mostly about his travels, the people he's met, and the movements he's been a part of, which I found refreshing. It also helped me reconcile my political ideals with my field of study, something I haven't always felt comfortable doing.