matburt, who replied to you, is one of the two developers, anoek is the other. These both also created nova.gs with which OGS was merged in October 2013, see Changelog; the design we see on GS now is all from nova.
I like your idea, I’d also like to learn more about these two, who, when one sees them in the chatrooms, always are friendly and helpful; About their motivation, about how they expect to be able to pay for it when it grows and needs more server power, etc. (and why there is no PayPal button ;-)); I believe it’s always a good idea to make people visible as humans, to de-virtualize them (i.e. ourselves) somewhat, so that they (we) are not just black Unicode characters on white background …
And here’s a post listing the current staff members.
Looking forward to read your interviews