Strictly speaking, the show is somewhat based on a series of novels. There’s an awful lot of story in those that is simply not present t in the musical, but could possibly have been included in the movie. I don’t know if that’s actually what happened, but there’s certainly a canon source for substantially more content.
As with nearly everything in astronomic optics, it’s named after people associated with its creation. Robert Jones and Thomas Bird are the two in this case. Here’s a thread on Cloudy nights with good info.