Barker was the harried assistant of newspaper magnate Henry Shaw Sr. (WFT).
When Langdon Shaw brings the Barebones to Shaw Tower, Barker was unable to keep the excited Langdon from interrupting his father and brother's meeting (WFT).
Barker was with Shaw Sr. when they make their way to the front of the crowd staring at the forcefield around the subway (WFT).
A barker is someone whose job is to attract attention and customers to a sideshow or other entertainment or curiosity.
The surname Barker means "tanner" (source: ancestry.com).