Sandra Barr is a faculty member in the Department of Earth and Environmental Science at Acadia University in Wolfville. Widely recognized as an expert in the geology of Nova Scotia, she is also coeditor of the scientific journal Atlantic Geology, and is book editor for the Geological Association of Canada.

Martha Hickman Hild has a PhD in Earth Sciences and is a member of the American Geophysical Union. Early in her career she codirected a research laboratory and lectured in geology. She also more than 25 years of experience in publishing, including work as a textbook editor and as a prizewinning news researcher.