I have come across Stephen's book recently. This is a very nice book about fifty thinkers. Main thing about this book is that one can get very concise background of those thinkers work in a very lucid prose. I have reread some of the chapters in order for me to reveal the beauty of his language and structure. I shall keep this book in my table as a reference book. Though fifty is not enough, there are more thinkers, but at least we are getting here fifty thinkers life and work in a very elegant way.