You're looking for a combination of characteristics in the manager you select: an experienced, mature person who is also very dynamic, forceful and able to do the job for you.
And Suri has inherited her 44-year-old dad's exuberance too: At her parents' Italian wedding in November, "It was quiet and then Suri cooed loudly, " says one guest.
Back then Franklin Roosevelt's wife Eleanor was a beloved (and detested) figure in his administration: opinionated, energetic and always on the go, clearly with her husband's blessing.
The two months recently spent on an advanced management programme at Harvard Business School, consorting with chief executives, has obviously rubbed off on Lewis, who is fizzing with energy.