Graham Phillips is a British investigator with a number of books  on ‘alternative history’ to his credit. One of them  originally entitled Act of God was republished in the USA with the title of Atlantis and the Ten Plagues of Egypt. This 358-page volume contains just TWO pages on Atlantis where the author suggests that the 2nd millennium BC eruption of Thera was the cause of the destruction of Atlantis. This unscrupulous retitling is a sad reflection on the standards of the American publishers.
>In 2004, Phillips published Templars and of the Ark of the Covenant  in which the promotional blurb claims that he has “compelling evidence that the Knights Templar may have taken the Ark of the Covenant to the British Isles” and “offers compelling documentation that the Ark may be located in the English countryside, not far from the birthplace of William Shakespeare at Stratford-upon-Avon.” I note the repeated use of the word ‘may’.<
His most recent book  offers evidence of a close encounter between the earth and a comet in 1485 BC that produced an apparition that may have appeared twenty times the size of a full moon. Phillips claims that it had a profound effect on those that witnessed it and led to widespread forms of monotheism, including that of Moses and Akhenaten. What is even more radical is his claim that the comet’s tail contained an amino acid such as vasopressin that can make humans more aggressive and which led to a simultaneous outbreak of wars in many parts of the world between nations that had previously lived in harmony with each other. This particular aggressive phase appears to have subsided after a period of about ten years.
>His most recent (2019) offering, Wisdomkeepers of Stonehenge  has a different approach to understanding Stonehenge, as explained by the cover notes “Graham argues that, with stones aligned to the sun, stars, and positions of the moon, stone circles were not just astronomical calendars, as some scholars have proposed, but were part of an elaborate system to determine precise timings necessary for the cultivation of medicinal plants. The Druids, he reveals, had medical knowledge well beyond their time, and may even have found a cure for cancer. Graham also discovers that the Megalithic people developed phenomenal memory techniques, resulting in a priesthood that became both the guardians of the stone circles and the living libraries of inherited knowledge. Wisdomkeepers of Stonehenge uncovers the long-forgotten secrets of the Megalithic people and the true extent of their astonishing achievements: a vast network of monuments, as important to the ancient peoples of the British Isles as the internet is for us today. The true purpose of Stonehenge is ultimately revealed. It was not just a religious monument, but served a vital, practical function – as a prehistoric healthcare facility.”<
Graham Phillips has also an official website(a).