Interestingly, though not a doctor, Barbara is the president of a similar Global_Health_Corps
http://en.wikipedia.org/wiki/Global_Health_Corps .
As for Jenna, aside her gig at NBC, she is involved in efforts against dyslexia, a very valuable goal.
http://en.wikipedia.org/wiki/Jenna_HagerI always felt sorry about them. I think that, considering the climate they were raised in, they turned out to be worthy young women. It cannot be easy to grow up under media' eyes. Wait until Malia or Sasha do their first stupid things as teens. Same goes for Chelsea Clinton (though I was disappointed to hear she followed the tracks of Jenna Bush and Ayla Brown and is now working for NBC. What is there with media to think that we need to hear about daughters of political men (Sigh. At least Ayla Brown has a communication degree, but it seems the two other ones are only there for their names).
Note: I am unclear what Alex accomplished. It may be because she is more private than her sister, but I honestly have no idea (not that it matters).