Lisa Ann Fanning writes:

Rob led a walk at the Celery Farm on Sunday for NJAS, and one of the participants came across two of these interesting caterpillars (above). I had them IDd as Brown Hooded Owlet Moth Caterpillar.

On the right is what it will look like if it survives till mothhood.

The Moth Photographers Group has a neat page about this moth.

The link is here.