Off planet bases in orbit, on Mars or our moon and beyond, who is needed?

We've all seen the movies, the captain of a ship or station performing beyond everyday tasks to save the crew, however little is ever spoken about the groups of scientist and field experts that would are required for an off world civilization to expand and thrive.
Therefore I open the question up to everyones voice, who would you like to see, which job roles are the most important and which will be left redundant?