How much do you need to know?

We are a small firm. Sometimes, it seems like it's just me. Other times, we are proud of our 4-person status. Either way, we are small.
To deal with the difficulty in competing against large firms when we are so small, we have traditionally tried to become really good at a whole series of tasks. We have also attempted (and are attempting again) to develop partnerships with other firms.
But as I contemplate what it takes to build a building, I realized there are quite a lot of tasks involved, and wonder whether one person could possibly do it all.
First, there's programming. This can be a specialty. There are people working for large firms who are programmers. That's all they do! How many other tasks could be single-person careers?
Marketing.
Contracts.
Code analysis.
Schematic design (these are the flowing capes and cool haircut crowd)
Energy modeling.
Detailing
Project management
Specifications
Life cycle costing
Construction administration
Interiors
Librarian
CAD manager
IT

And this list does not include the fun stuff, like research, strategic visioning, or all the professional community tasks, like AIA and CSI involvement. The more I think about it, the more I think about the phrase "head splitting."