MusicRadar says:

For jazz purists, Herbie Hancock embracing synthesizers was akin to Bob Dylan going electric, but that’s exactly what he did in the early 1970s. His ‘Mwandishi’ albums are particularly notable for their use of electronic keyboards - ARP’s Odyssey, 2600 and Pro Soloist and the Moog III in particular. And, of course, everybody knows 1983’s synth-powered Rockit, which was also one of the first big hits to contain scratching.

Your votes:

"I would say Kraftwerk, Herbie Hancock, and probably Moog himself!" (From @rockengi via Twitter, thanks)

"How could I forget Herbie Hancock on my list? Oh, I didn't have enough room!" (From @hollavacui via Twitter, thanks)

"Jean-Michel Jarre, Vangelis, Kraftwerk, Herbie Hancock and number one should be Dr Robert Moog!" (From Peter via Facebook, thanks)

“Herbie Hancock was one of the first jazz greats to go synth.” (Thanks, fatfreddy)

Next: Tangerine Dream