Why should I be concerned with what their experience is? They are five in toto. I'm glad that they have not been discriminated against.
It is not Ad Hominem to think what you think. It is Ad Hominem to attack the person instead of the argument. It is also fruitless to attack a person's opinion, just don't accept it as your own and leave it at that.
All the more reason to examine a large and diverse group, such as the signers of the Discovery Institute statement.
I might mention that what Ben Stein is charging is McCarthyism. That was a dubious kind of victimhood, even when it was the real thing. Hollywood really did shut down careers, pretty much monolithically. But talented people worked around it.
But neither you nor Ben Stein have named anyone who has become unemployed or who has been forced to take a menial job outside the realm of biology. Or mathematics, as the case may be.