The book "A Brief Biographical Sketch of William Penn" was written by Charles Evans, an American author who studied the history of the United States and the influence of great figures on the formation of the country. In his work, he examines the life and activities of William Penn - one of the founders of the Pennsylvania colony and one of the key figures of early American history. The book details the childhood, youth, religious beliefs and public activities of William Penn, revealing important aspects of his life, influence on the colony and relationships with other colonists and the government of the British Empire. In the book, the author talks about William Penn's significant contribution to the formation of democratic traditions in America and his influence on the development of the country's political culture.