Albert Gallatin Mackey (1807–1881) was a prominent American medical doctor, author, and Freemason, recognized for his extensive work in Masonic literature and jurisprudence. Born on March 12, 1807, in Charleston, South Carolina, Mackey pursued a career in medicine but his interest in Freemasonry prevailed, leading him to become one of the most influential Masonic scholars of his time. After being initiated into Freemasonry in 1841, Mackey dedicated himself to the study and interpretation of Masonic symbols, rituals, and governance. His seminal work, 'The Principles of Masonic Law' (1856), is a foundational text that delineates the general constitutional laws, practices, and theory of legal procedures within Freemasonry. The significance of this book lies not only in its meticulous chronicling of Masonic regulations but also in its analytical approach to Masonic jurisprudence and governance, thus serving as a standard reference for Masons worldwide. Mackey's literary style blends scholarly rigor with a clear, accessible exposition of intricate topics. His contributions to Masonic literature also include the comprehensive 'Encyclopedia of Freemasonry' and a number of other texts pivotal to the understanding of Masonic history and symbolic instruction. As an esteemed figure in Masonic circles, Mackey's was lauded for his intellectual pursuits, which have left a lasting legacy on Masonic scholarship.