What is the author's style in Black Pioneers of Science and Invention by Louis Haber?

Dr. Louis Haber was an educator invested in creating science textbooks for young students. Haber realized the blatant lack of information regarding the inventions and contributions made by African Americans. The book, BLACK PIONEERS OF SCIENCE AND INVENTION addresses fourteen of the most prolific and influential scientists and inventors in history. Haber did a significant amount of research on each Pioneer's personal and professional life and presented a complete picture of the hard work, dedication, triumphs and tribulations faced by each man.