The book ''Who is this Shamachurn'' forms the last of the trilogies on Shamachurn, the Fountion-Head of Kriyayoga, the first beimg ''Purana PurushaYogiraj Sri Shamachurn Lahiree'' , an authentic biography on Shamachurn, the annotation of one hundred ''Shamachurn Kriyayoga and Non-Duality'' an annotation of hundred quotation of Lahiree Mahasaya.