Question: Where is the headquarter located of which John Claiborne was an early president?
Sentence (from "John Claiborne (baseball executive)"): John W. Claiborne III (born 1939) is a former front-office executive in American Major League Baseball who also was an early president of the New England Sports Network (NESN), a regional cable television network primarily (80 percent) owned by the Boston Red Sox that telecasts Red Sox baseball and Boston Bruins National Hockey League games.
Relevant evidence: Yes