Original: Allan Kardec was a pseudonym of the French teacher and educator Hippolyte Léon Denizard Rivail (Lyon, October 3, 1804 – Paris, March 31, 1869), who is known today as the systematizer of Spiritism.
Simplified: Allan Kardec  (Hippolyte Léon Denizard Rivail October 3, 1804 - March 31, 1869) was a French philosopher and teacher.