I'm not sure if I should replace Pete Namlook with Klaus Schulze, they're both so prolific.. Schulze, of course, being the elder producer who has accomplished so much should win out but Namlook started the fax label which has put out so much great music..
Genesis P. Orridge also comes to mind.. Throbbing Gristle, Psychic TV.. transgender, transgenre, way out there.. If innovation comes to mind I think of they. True progressive futurist stuff, plus every time Genesis speaks I can't help but be rapt.
Also on the transgender trip.. Walter/Wendy Carlos.. Switched on Bach, classic music repurposed to analogue modular synthesizers.. Kind of backwards, but supremely well done, it must have been a nightmare to multitrack that.
I don't think I've seen Orbital or Future Sound of London mentioned here, either, on a more contemporary note.
Eh.. I can't leave out Front 242 on this post either, a huge impact on the early electro-industrial scene and very dear to my heart as being a kind of introduction to electronic music for me.. (I'm 32, Tyranny for You being one of my first electronic music albums)