Albert Pike was an American author, poet, orator, editor, lawyer, jurist and Confederate States Army general who served as an associate justice of the Arkansas Supreme Court in exile from 1864 to 1865. He had previously served as a senior officer of the Confederate States Army, commanding the District of Indian Territory in the Trans-Mississippi Theater. A prominent member of the Freemasons, Pike served as the Sovereign Grand Commander of the Supreme Council, Scottish Rite from 1859 to 1891.

Albert Schwegler was a German philosopher and Protestant theologian.

Ludwig Philipp Albert Schweitzer was an Alsatian polymath. He was a theologian, organist, musicologist, writer, humanitarian, philosopher, and physician. A Lutheran minister, Schweitzer challenged both the secular view of Jesus as depicted by the historical-critical method current at this time, as well as the traditional Christian view. His contributions to the interpretation of Pauline Christianity concern the role of Paul's mysticism of "being in Christ" as primary and the doctrine of justification by faith as secondary.

Albrecht Dürer, sometimes spelled in English as Durer, was a German painter, printmaker, and theorist of the German Renaissance. Born in Nuremberg, Dürer established his reputation and influence across Europe in his twenties due to his high-quality woodcut prints. He was in contact with the major Italian artists of his time, including Raphael, Giovanni Bellini, and Leonardo da Vinci, and from 1512 was patronized by Emperor Maximilian I.

Aldous Leonard Huxley was an English writer and philosopher. His bibliography spans nearly 50 books, including novels and non-fiction works, as well as essays, narratives, and poems.

Alexander Raban Waugh was a British novelist, the elder brother of the better-known Evelyn Waugh, uncle of Auberon Waugh and son of Arthur Waugh, author, literary critic and publisher. His first wife was Barbara Jacobs, his second wife was Joan Chirnside and his third wife was Virginia Sorenson, author of the Newbery Medal-winning Miracles on Maple Hill.

Aleister Crowley was an English occultist, philosopher, ceremonial magician, poet, painter, novelist and mountaineer. He founded the religion of Thelema, identifying himself as the prophet entrusted with guiding humanity into the Æon of Horus in the early 20th century. A prolific writer, he published widely over the course of his life.

Alessandro Francesco Tommaso Antonio Manzoni was an Italian poet, novelist and philosopher. He is famous for the novel The Betrothed (1827), generally ranked among the masterpieces of world literature. The novel is also a symbol of the Italian Risorgimento, both for its patriotic message and because it was a fundamental milestone in the development of the modern, unified Italian language. Manzoni also contributed to the stabilization of the modern Italian language and helped to ensure linguistic unity throughout Italy. He was an influential proponent of Liberal Catholicism in Italy. His work and thinking has often been contrasted with that of his younger contemporary Giacomo Leopardi by critics.

Alexander Aaronsohn was an author and activist who wrote about the plight of people living in Palestine in his book, With the Turks in Palestine.

Alexander Bain was a Scottish philosopher and educationalist in the British school of empiricism and a prominent and innovative figure in the fields of psychology, linguistics, logic, moral philosophy and education reform. He founded Mind, the first ever journal of psychology and analytical philosophy, and was the leading figure in establishing and applying the scientific method to psychology. Bain was the inaugural Regius Chair in Logic and Professor of Logic at the University of Aberdeen, where he also held Professorships in Moral Philosophy and English Literature and was twice elected Lord Rector of the University of Aberdeen.