David W Houseknecht
David Houseknecht is a Senior Research Geologist for the USGS Geology, Energy & Minerals (GEM) Science Center in Reston, VA.
Official websites use .gov
A .gov website belongs to an official government organization in the United States.
Secure .gov websites use HTTPS
A lock () or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.