Is there any famous alumni from Pennington School?

Pennington School doesn't have a huge number of globally famous alumni in the same way some Ivy League schools do. Its prominence is more regional. You won't find many household names. However, depending on your definition of "famous," you might find some alumni who achieved success in their fields but aren't necessarily widely known to the general public. To find specific examples, you'd likely need to consult the school's alumni directory or archives.