What is the author's style in Madame Curie by Marie Curie?

The biography is divided into three parts that reflect three stages of Marie Curie's life; her youth and childhood in Poland, her university education and marriage to Pierre Curie in France, and her later years as she continued to raise her daughters and work at the Institute of Radium in Paris. Each of the three parts of the biography is divided into chapters that narrow focus on Marie Curie's life. For instance, Chapter XII is concerned with Marie's experiments with radiation that led her to discover polonium and radium.