Henry Calderwood was born on May 10, 1830, in Peebles, Scotland.

He was a Scottish minister, philosopher, and author. He attended the Royal High School in Edinburgh before entering the University of Edinburgh. He studied for the ministry of the United Presbyterian Church of Scotland, and in 1856, he was ordained pastor of the Greyfriars Church, Glasgow. He also served as an examiner in Mental Philosopher at the University of Glasgow from 1861 to 1864, and from 1866 he taught the moral philosophy classes at that university. In 1868, he left the parish ministry to become Professor of Moral Philosophy at Edinburgh where he remained until his death in 1897. In 1869, he was elected a Fellow of the Royal Society of Edinburgh. He published several books on a wide variety of philosophical, religious, and educational subjects. His first and most famous work was “The Philosophy of the Infinite” (1854). He wrote “A Handbook of Moral Philosophy” as a textbook for students in Edinburgh. His other books “On the Relations of Mind and Brain, Science and Religion” and “The Evolution of Man's Place in Nature” were devoted to different aspects of the science/religion debate which dominated much of the world of ideas in the later 19th century Scotland. Among his religious works the best-known is his “Parables of Our Lord”, and just before his death he finished a “Life of David Hume” in the Famous Scots Series. He was the first chairman of the Edinburgh School Board, a philanthropist, temperance campaigner, and a Liberal Unionist at the time of the Home Rule Bill. He was awarded the honorary degree of LL.D. by Glasgow in 1865.

In 1857, he married Anne Hutton Leadbetter. He died on November 19, 1897, in Edinburgh, Scotland.

James Caldwell was a Montreal-based merchant. He was also known for his military involvement in Lower Canada as he was appointed militia captain in 1797, major in 1811, and lieutenant-colonel of the 1st Battalion in 1813. Caldwell died on 18 April 1815 after a long and painful illness which left him frail and weak.

William Caldwell was born in Edinburgh and educated at Edinburgh University, where he won the Shaw Fellowship. After post-graduate work in Germany, France and Cambridge, he came to the United States in 1891, and taught philosophy at Cornell, the University of Chicago, and Northwestern University. In 1903 he became Macdonald Professor of Moral Philosophy at McGill, a position he held until his retirement in 1929. Caldwell's travels and lectures in Europe took a new turn after the First World War when he developed a special interest in the new nations of Eastern Europe, particularly Poland under its philosopher-president, Masaryk. He was decorated by the governments of Poland, Czechoslovakia and Yugoslavia for his promotion of their interests in the English-speaking world. Caldwell also wrote two major philosophical studies on Schopenhauer and on Pragmatism and Idealism. He passed away in 1942.