Sarah has described the life and philosophies of the major names in history of existentialism. If you are interested in phenomenology and existentialism then you would like her commentary on life contributions and times of these famous philosophers.
But that is one reason why the existentialists demand rereading. They remind us that human existence is difficult and that people often behave appallingly, yet they also show how great our possibilities are. They constantly repeat the questions about freedom and being that we constantly try to forget. We can explore the directions the existentialists indicate without needing to take them as exemplary personalities, or even as exemplary thinkers. They are interesting thinkers, which I believe makes them more worth our trouble.
I first found them interesting thirty years ago, and I still do now — but for different reasons. Looking back at them has been a disorienting and stimulating experience, like seeing familiar faces in a fairground mirror. Some features I had barely noticed before have become more prominent, while others, which used to seem beautiful, have acquired a grotesque cast. Writing this book has brought me surprises all the way, not least with the two colossi of the story, Heidegger and Sartre.