Question: Who is the founder, owner and president of the Boras Corporation who's clients include an American professional baseball center fielder for the New York Yankees who  played in MLB for the Boston Red Sox from 2007 through 2013, and joined the Yankees before the 2014 season ?
Sentence (from "Scott Boras"): Since 2013, Forbes magazine has named Boras the "Most Powerful Sports Agent in the World."
Relevant evidence: No