His 1969 volume The View Over Atlantis has been described as probably the most influential book in the history of the hippy/underground movement and one that had far-reaching effects on the study of strange phenomena: it “put ley lines on the map, re-enchanted the British landscape and made Glastonbury the capital of the New Age.” In some 40-odd titles over five decades he examined, often in pioneering style, such topics as sacred geometry, earth mysteries, geomancy, gematria, archaeoastronomy, metrology, euphonics, simulacra and sacred sites, as well as Fortean phenomena. An abiding preoccupation was the Shakespeare authorship question. His Who Wrote Shakespeare? (1996) was reckoned by The Washington Post “the best overview yet of the authorship question.”