Primarily the people who developed the idea for the city, built it, or designed the grand scheme of the plan.
After that, there's a degree of "What kinds of people are needed to run a self-sufficient city?"
Granted, there're a lot of politics involved, so you see a bit of a demographic shift and controversial figures - Despite being in Panama, the city is going to have heavy influence from Canadians, New Zealanders, Americans, Japanese, and Australians (the major funders and developers of the project), and quite a few "financial contributors" are going to find themselves on the short list, regardless of actual usefulness.