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Presumably humans.

As far as we know, Aeolia Schoenberg produced the theory and then Celestial Being's scientists team later made it. We have confirmed that the 5 Original Drives that Celestial Being uses are produced by human scientist at the planet Jupiter in S1 Novel 2.

Original GN Drives requires a high gravity environment in order to be made, specifically for the TD Blanket Component. However, the requirement of Jupiter's atmosphere was not foreseen by Aeolia [according to S2 Official File Volume 6] and was only discovered by later generation Celestial Being scientists. The expedition was launched around 120 years prior to Season One.

-SonicSP 11:38, June 22, 2010 (UTC)