Mary served as superintendent of Grand Teton National Park and the John D. Rockefeller, Jr. Memorial Parkway from May of 2004 through early 2014. During her tenure, the Craig Thomas Discovery and Visitor center and auditorium were built, the 1,100 acre Laurance S. Rockefeller Preserve was restored and transferred to the NPS, park headquarters was expanded and renovated, the Vernon Indian Arts collection underwent restoration, and 15 miles of pathways were constructed. She also initiated the NPS Academy, Youth Conservation Program and Wildlife Brigade during her tenure. During her 34 year National Park Service career, Mary served in management positions as Acting NPS Intermountain Regional Director in Denver; in Santa Fe and Carlsbad Caverns (NM); Golden Gate, Santa Monica Mountains and Channel Islands (CA); Gateway (NY); and Blue Ridge Parkway (VA). In addition to NPS experience, Mary also served with the DOJ U.S. Attorney’s Central District of California office, Army Corps of Engineers, and performed environmental consulting in a private firm. Mary served six years on the Student Conservation Association Board of Directors, and was on the Jackson Hole Airport Board until late 2019.