-Viktor E. Frankl
Psychiatrist Dr. Viktor E. Frankl was a Holocaust survivor who used his time in concentration camp to study the reasons why some prisoners were miraculously able to maintain a glimmer of hope, while others (understandably) lost their will to live. In spite of the horrific subject matter, this book is strangely uplifting. It's sort of a cross between Maus: A Survivor's Tale and The Little Prince.