Thomas Weisser is considered by some to be an authority on Modalistic Monarchianism. In 1984, he was asked to speak at Harvard’s Symposium on Oneness Pentecostalism. He was listed in Who’s Who in Religion for his research and discoveries in this book, as well as in some of his other works, including Anti-Trinitarianism of Early Quakers and Three Persons, which expose the pagan roots of Trinitarianism.