edit: ok, i was being too flippant in the above.
I do know the history although as I understand it, the notebook type interface was developed in a few places in the 80s, mathematica being one of them, maple soft another - and all of these influenced by Macsyma and related earlier systems but taking advantage of the improved graphic capabilites as they became available. Not that I was watching this unfold in the early 80s so I might have that wrong.
My flippancy was related to the typical Wolfram self-aggrandizing waffle in the PR approach, and the fact that the most useful part of this (the announced) is arguably deployment to standard web tooling, which a number of at least similar space systems have been doing for the last several years.