The Handbook of Celtic Astrology: The 13-Sign Lunar Zodiac of the Ancient Druids (Llewellyn's Celtic Wisdom)
Helena Paterson (Cornwal, England) is a professional astrologer who has been a member of the British Astrological Association since 1978.  She is also a herbalist and frequently draws on herbal lore in her astrological work.  She has Celtic blood through both sides of her family.