Born William Frederick Allan in 1860, Leo knocked about in his early years. As he wrote of himself, "...it was not until his thirtieth year, in 1890, when the progressedJupiter arrived at the place of the radical Sun, that the effect of theradical Asc. conjunct Saturn was removed and a period of prosperitycommenced, for in that year the Astrologer's Magazine (nowModern Astrology) was commenced, and all other pursuits wereput on one side in order to take up the study of Astrology as a lifework. Thenceforward all other progressed positions, no matterhow severe or evil, must be moderated by this benefic progress ofJupiter over the Sun, trine Moon; for to considerably accentuatethis benefic influence, Jupiter at the same time by progressionreaches the parallel of the Sun at birth, a position which will remainin force for a great many years." (Progressed Horoscope,pgs. 228-9)
Among other duties, Alan Leo and his associates had a livelymail-order chart business, and wrote and published manybooks and articles. He died in 1917. Of his seven majorbooks, Charles Carter famously said, "They were not wellput together but one could find a very great deal of informationin them if one knew where to look."
This is one of the best books on progressions ever written.Look carefully and you will find a great many things in it.