Sure sounds like it. Though I'm fairly certain that I wouldn't forget Grimm's name like that (the tales are childhood's staple where I am)—so maybe Rasmus Rask

Sure sounds like it. Though I'm fairly certain that I wouldn't forget Grimm's name like that (the tales are childhood's staple where I am)—so maybe Rasmus Rask or Karl Verner was instead mentioned when I heard of the general concept being attributed at all. Which, rather weirdly, was only one time in a lecture by Andrey Zaliznyak on Youtube, even though I heard of how shifts work before and after that—you'd think such an important discovery would at least more often bear the name of its author.