Daniel Christiansen

Daniel Samuel Christiansen (November 27, 1904 - September 26, 1994) was a Danish-born American carpenter, held to be the author of technical illustrations and documents detailing a religiously-inspired UFO belief, including blueprints for what has been colourfully labelled by devotees as the "Alien Puma Space Train" (APST), which were first published online in late 2013.