Hmm. Clem has a far richer recollection than I do. I don't recall Dan's version, but I defer to Clem.

I do have a vague recollection of a program called cr3 intended to mimic the tty driver thing. Perhaps that was Dan's version.

I note that my 4.1BSD manual more(1) says the author is "Eric Shienbrood, minor revisions by John Foderaro and Geoffrey Peck."

Wikipedia says "more" was written by Daniel Halbert and expanded by Eric Shienbrood and Geoff Peck.

I also believe that is partially true and Mary Ann is actually correct in the provenance.

I think Eric arrived later than Dan (maybe a year later), but was also ex-MIT, and he too had used/seen --MORE-- on ITS as Dan had.  But I was under the impression Eric started over.  Then a few years after Eric, Geoff worked with Eric's sources to add a few features.  As for starting over/hacking on the program from Dan's original code base, it's hard to call that one, as  I recall that Dan's version was not much more than a hack on to cat(1). i.e. the original version was pretty simple, and I don't remember that it 'knew' about the type of terminal being used, get info from TERMCAP et al.