This is a classical textbook for mathematical statistics. I have to say that this book is barely ok and clearly not a perfect one as it lacks the necessary rigorous math treatment. It seems to be too easy for a student with good math background but shows evil sides to those unprepared guys. A big advantage of this book is that it includes a lot of exercise and some of them are really interesting and can even elicit some research ideas. The authors also provide a solution manual for us covering most of the exercises. These comments are made after I read the first five chapters and finish all the exercises. I also borrow some parts of this book in my own teaching. It will be updated later in this year.