Editor. Born at Ormiston (East Lothian), the son of a farmer and cattle-dealer. With his friend William Ritchie (1781 - 1831), and others, MacLaren founded the Edinburgh-based Scotsman newspaper in 1817 and served as its editor for 25 years. He maintained an interest in Geology and became editor of the 6th edition of the Encyclopaedia Britannica (1820). He served as President of the Geological Society of Edinburgh (1864-66).
He is buried in Grange Cemetery (Edinburgh).