Archibald McLellan (1857-1917) was born in Moncton, New Brunswick, Canada, and died in Brookline, Massachusetts. He was educated in Boston, Massachusetts, and married Jeannette Reid in 1885, when they were both visiting Cleveland, Ohio. The couple moved to Chicago, Illinois, the following year, where McLellan held a high position with the R. G. Dunn Agency. He received a law degree from Kent College of Law in Chicago in 1895. The McLellans took Primary class with Ruth B. Ewing, one of Mary Baker Eddy's students, and later had Normal class under the Board of Education. McLellan joined First Church of Christ, Scientist, Chicago, in 1895 and served as trustee and chairman of the Executive Board. He joined The First Church of Christ, Scientist, in Boston, Massachusetts, on July 3, 1897, and was working as Committee on Publication for Illinois when he was called to Boston by Eddy in 1902 to be Editor of her periodicals (the Christian Science Sentinel and The Christian Science Journal). His editorial work expanded in 1903 when the German edition of The Herald of Christian Science began. That same year, he became the fifth member of the Christian Science Board of Directors and was chairman until June 1916. At Eddy's bidding, he acquired a property in Chestnut Hill, Massachusetts, and prepared it for her occupancy. Eddy also appointed him as one of three Trustees of her estate. When The Christian Science Monitor was launched in 1908, he was named its first Editor-in-Chief and remained so until 1914. He was a 32nd degree Mason and belonged to the National Press Club of Washington, D.C., Boston Press Club, Boston City Club, and the Canadian Club of Boston.

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