Works on the VMS by Jeffrey P. Krischer

[ReneZ]

Ages ago, Jim Reeds wrote to someone called Jeffrey Krischer who had become a medical doctor, asking if he was the one who write the Harvard paper, which he confirmed. When Jim then asked for a copy, there was no further response.

Rumour has it, that he experimented with Hidden Markov chains, and this technique was at that time considered of some security relevance, so the paper was 'removed from sight'. I am not sure how reliable that information is.

Mary D'Imperio did a similar investigation, using an alogirthm called PTAH. This was classified for some time, but has now been declassified, even though some parts of the text have been redacted. Recent news events should make that this terminology is known to most people by now...

If the above is true, he would not have been motivated to continue this work. At the same time, much progress has been made in the area of Hidden Markov chains, though this is not too well documented.