Phillip S. Greenwalt graduated from George Mason University with a M.A. in American History and also has a B.A. in history from Wheeling Jesuit University. He started with the National Park Service as a historical interpreter intern at Fredericksburg and Spotsylvania National Military Park. Before becoming a Supervisory Park Ranger of the Shark Valley District of Everglades National Park, he was a Historian-Park ranger at George Washington Birthplace National Monument and Thomas Stone National Historic Site.
He is a full-time contributor to the blog Emerging Civil War and co-founder of the Emerging Revolutionary War blog.
Besides the interest in American History, he is an avid Baltimore Orioles baseball and Maryland athletics fan.