For impact, its important to have a current (within five years) portrait of you.
For those in business or working with the public in any way, it is a connection to your clientele (or potential clientele) . It is usually your all important: First Impression.
That impression is key. You want to look your best and you should, because its basically a job interview.
I actually like helping people look their very best, and for studio work, will often use 5 light sources to achieve that.
Here are some recent executive portraits from everything from Doctors to Realtors to on air radio personalities.