Albert Gallatin Mackey (March 12, 1807 - June 20, 1881) was an American medical doctor and author. He is best known for his writing many books and articles about freemasonry, particularly the Masonic Landmarks.Albert Gallatin Mackey was born in Charleston, South Carolina, the son of John Mackey (1765 - December 14, 1831), a physician, journalist and educator, and his wife. His father published The American Teacher's Assistant and Self-Instructor's Guide, containing all the Rules of Arithmetic properly Explained, etc. (Charleston, 1826), the most comprehensive work on arithmetic that had been published in the United States. His brother was Edmund William McGregor Mackey, later a member of the U.S. House of Representatives from South Carolina. After completing his early education, Albert Mackey taught school for some time to earn money for medical school. He graduated from the medical department of the College of South Carolina in 1832. He settled in Charleston, South Carolina.