Alexander D. Mitchell IV is a writer and photographer specializing primarily in railroad and transportation issues and history. He is also the author of Washington, D.C. Then and Now. Born and raised in Selinsgrove, Pennsylvania, he now resides in Baltimore, Maryland. Paul Kelsey Williams is the author of 12 books on Washington, D.C. neighborhoods, institutions, and themes, the Charles Village neighborhood in Baltimore, and Skaneateles and Owasco Lakes in upstate New York. His other books include Lost Baltimore and Lost Washington, D.C.