As this Wall Street Journal article explains, with the increased popularity of genealogical research, the demand for the work done by historical photo detectives has increased.

"Maureen Taylor has dated a photograph to 1913 by studying the size and shape of a Lion touring car's headlamps. Armed with her collection of 19th-century fashion magazines, she can pinpoint the brief period when Victorian women wore their bangs in tight curls rather than swept back. Using a technique borrowed from the CIA, she identified a photo of Jesse James by examining the shape of his right ear."