I heard from David Neidig recently. He is living in Tennessee with his wife and two children. He's an elementary school teacher. He is a former member of the Avery Trace Bluegrass Band.
Hopefully I will have more of David's accomplishments to add here soon.
Update:
In July, 2023 David Neidig passed away. He is sorely missed.
I wrote a small tribute to David and you can read it here