G'day Bangalore, Thank you for your question. It seems that no one has been credited with it. According to Wikipedia ""Last Post" was originally a bugle call used in British Army camps to signal the end of the day. The name derives from the practice of inspecting all the sentry posts around such a camp at the end of the day, and playing a bugle call at each of them. The "last post" was thus the last point of this inspection, and the bugle call signalling that this post had been inspected marked the end of the military day. This custom dates from at least the 17th century, and originated with British troops stationed in The Netherlands, where it drew on an older Dutch custom, called Taptoe. The Taptoe was also used to signal the end of the day, but has more prosaic origin. Taptoe originated signalling the moment that beer barrels had to be shut, hence that the day had ended. It comes from the Dutch phrase Doe den tap toe, meaning "Turn the tap off": however the Dutch "Taptoe" bugle call Taptoesignaal, now used for remembrance events, is not the same tune as the Last Post. Neither the Last Post nor the Taptoesignaal are to be confused with the US call "Taps" which has a similar function but different tune and origin." Regards