the teams organigramme on the operative side is:
Brawn as Team Principal and Fry as CEO -
Bob Bell as Technical director in a big company those people are usually called CTO (technical direction/strategies ,budget ,staff strategies,Equipment etc
Below sits Geoff Willis ,reporting to Bell -Integrating Aero-Vehicle dynamics and System groups and
Aldo Costa heads R&D ,Design and Transmission
Mike Elliot as Head of Aero reports to Geoff Willis
John Owen as chief designer reports to Costa
In fact they have now basically three levels of leadership on the operative side even before you go into systems level detail.
Obviously a formula 1 team is not a small business these days and it is very clear there is a lot of meetings and commitee work ,task force ,workgroup etc non productive doings around just to make sure the level of communication(or better information) is somewhat acceptable.