Barker is the harried assistant of newspaper magnate Henry Shaw Sr. (WFT).
When Langdon Shaw brings the Barebones to Shaw Tower, Barker is unable to keep the excited Langdon from interrupting his father and brother's meeting (WFT).
Barker is 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).