The National Park Service Night-Sky Team is a group of National Park Service Rangers and astronomers that are working to protect and preserve the views of naturally dark starry skies above America's National Parks. Dr. Nordgren has been an member of this special team since encountering their work at an evening ranger program in Yosemite National Park in 2005.  Since that time, Dr. Nordgren has travelled the park system working with park rangers and visitors to share the importance of preserving these natural night-sky vistas for the enjoyment of future generations. This work takes on added importance when we consider that recent population statistics indicate roughly half the children born this year will never see a natural night sky with a view of the Milky Way overhead. And park visitors realize this as the sight of the Milky Way is now as rare as the view of geysers, grizzly bears, and granite cliffs that bring millions of visitors to the parks each year. Dr. Nordgren promotes this work to save these last remaining dark-sky preserves through his writing, photography, and illustration. In 2011, he was elected to the Board of Directors for the International Dark-Sky Association.