Henry Clay Sheldon (1845-1928) was educated at Yale University and Leipzig University. Early in his career he served (Methodist) pastorates in St. Johnsbury, Vermont and Brunswick, Maine. From 1875-1921 he was Professor of Systematic Theology at Boston University. Prof. Sheldon was particularly critical of Theosophy and New Thought. His books include:

• The History of the Christian Church (2 vols.)
• The History of Christian Doctrine (5 vols.)
• Unbelief in the Nineteenth Century: A Critical History
• Christian Science So-Called
• A Fourfold Test of Mormonism
• Studies in Recent Adventism
• Theosophy and New Thought
• The Mystery Religions and the New Testament
• Pantheistic Dilemmas and Other Essays in Philosophy and Religion
• The Essentials of Christianity

(Source: Wikipedia)