Alex Russell, an engineer on the Chrome team, was kind enough to take up my question, with an answer which I think is too good not to share broadly, and which he was kind enough to let me share it.

FORBES: Chrome: A Google Eye View

An enthusiastic team player and a charismatic leader, Mr Mulally was also regarded by his colleagues as an engineers' engineer, since he based his decisions on hard data rather than vague hunches.

ECONOMIST: Face value

As a next step, Mr. Heuken always assembles a team that includes an architect, landscape architect and engineer.

WSJ: Creating: Peter Heuken, Playground Designer