The name "Llewellyn" could refer to several different authors, and without more specific information, it's difficult to provide a precise description. However, one of the most notable references may be to Llewellyn Worldwide, a company rather than an individual author, which is one of the largest publishers of occult, astrology, and New Age books. The company was founded by Llewellyn George in 1901 and has published books by various authors on topics such as Wicca, tarot, Reiki, and herbalism. If you are referring to a specific author with the surname Llewellyn or a different related context, please provide additional details, and I will be happy to give you a more focused description of that author's background and works.