Raymond Moody was the first to write about NDEs
Follow-up research was done by Bruce Greyson, who introduced the so called Greyson scale to determine the depth of the NDE.
The first prospective research was done in The Netherlands. This research was conducted under the responsibility of the Merkawah foundation, which was later renamed into Netwerk NDE. It was published in the scientific medical journal The Lancet. The article was written by the cardiologist Pim van Lommel together with Ruud van Wees, Vincent Meyers, and Ingrid Elfferich. The Lancet article can be downloaded through Pim van Lommel's website,
This research was repeated several times in other countries, like the USA and The United Kingdom.
A comprehensive prospective research was conducted by Sam Parnia et al. The first results of this so called AWARE study (AWAreness during REsuscitation) were published in 2014. There plans for a follow-up study.
New research was also done in The Netherlands. This research is an analysis of a large number of veridical observations, that were well documented and verified. It was done by Titus Rivas, Anny Dirven, and Rudolf Smit, and was published in Dutch (Wat een stervend brein niet kan) and English (The Self does not Die – Verified Paranormal Phenomena from Near-Death Experiences)