An eminent English Theosophist, Sepharial was a well-known and respected astrologer in the late 19th and early 20th centuries and wrote numerous books, some of which are still highly regarded today. He was editor of "Old Moore's Almanac", which is still published in the 21st century.

He became a very influential author in the fields of the occult, astrology and numerology, and his writings had a considerable impact on E. H. Bailey and Alan Leo, who he introduced to Theosophy. He can be credited as the first astrologer to use Earth's "dark moon" Lilith in his calculations. Genuinely erudite, Sepharial had for example a greater knowledge of mathematics, astronomy, and historical methodology than most of his astrological contemporaries and this showed in his writings. Sepharial's "Degrees of the Zodiac Symbolised" (co-written with Charubel) foreshadowed Marc Edmund Jones's subsequent (and nowadays better known) work on Sabian Symbols. However, many of his books and other works were put together in a rather slapdash way, which made his reputation less enduring than it might have been. A colourful character, Sepharial started a number of astrological magazines, all of which failed to establish themselves