Question: Kelley Blue Book is part of a company based in Atlanta, GA which is headed by whom?

Context paragraphs:
Multivox: Multivox was an American-based synthesizer company since the mid-1970s until the 1980s.  Originally it was founded in the mid-1940s as the guitar and amplifier manufacturing subsidiary of Peter Sorkin Music Company (Sorkin Music), a New York-based retailer/wholesaler.  Then eventually it established separate corporate identity, and after the close of Sorkin Music in the mid-1970s, it continued in existence for fourteen years, according to the "Blue Book of Guitar Values".  In addition to synthesizers, the company marketed several effects pedals.  These included the Big Jam series guitar effects line.

Cox Automotive: Cox Automotive is an Atlanta-based business unit of Cox Enterprises, formed in 2014 to consolidate all of Cox's global automotive businesses, including Kelley Blue Book, Xtime, Autotrader.com and Manheim.

The Blue Book Network: The Blue Book Network, also known as The Contractor's Blue Book or simply as The Blue Book, is a marketing, workflow software and print media company.

Cox Enterprises: Cox Enterprises, Inc. is a privately held American conglomerate based in Atlanta.  Cox is also a communications and automotive services company.  Cox Enterprises is currently headed by the daughter of founder James M. Cox, Anne Cox Chambers, and the two children of her late sister Barbara Cox.  Its chairman is Barbara Cox's son, James C. Kennedy.  Fourth generation members of the Cox family serve on the company's board of directors The family and company were highlighted in a 2015 Forbes article called "This Billionaire Knows the Secret to Saving a Family Business".

The People That Time Forgot (novel): The People That Time Forgot is a fantasy novel by American writer Edgar Rice Burroughs, the second of his Caspak trilogy.  The sequence was first published in "Blue Book Magazine" as a three-part serial in the issues for September, October and November 1918, with "The People That Time Forgot" forming the second installment.  The complete trilogy was later combined for publication in book form under the title of "The Land That Time Forgot" (properly speaking the title of the first part) by A. C. McClurg in June 1924.  Beginning with the Ace Books editions of the 1960s, the three segments have usually been issued as separate short novels.

Little Blue Book: Little Blue Books are a series of small staple-bound books published in 1919-1978 by the Haldeman-Julius Publishing Company of Girard, Kansas.  They were extremely popular, and achieved a total of 300-500 million booklets sold over the series' lifetime.  A Big Blue Book range was also published.

Out of Time's Abyss: Out of Time’s Abyss is a fantasy-science fiction novel by American writer Edgar Rice Burroughs, the third of his Caspak trilogy.  The sequence was first published in "Blue Book Magazine" as a three-part serial in the issues for September, October and November 1918, with "Out of Time's Abyss" forming the third installment.  The complete trilogy was later combined for publication in book form under the title of "The Land That Time Forgot" (the title of the first part) by A. C. McClurg in June 1924.  Beginning with the Ace Books editions of the 1960s, the three segments have usually been issued as separate short novels.

Tiffany Blue: Tiffany Blue is the colloquial name for the light medium robin egg blue color associated with Tiffany & Co., the New York City jewelry company.  The color was used on the cover of Tiffany's "Blue Book", first published in 1845.  Since then Tiffany & Co. has used the color extensively on promotional materials, including boxes and bags.

Robertson Panel: The Robertson Panel was a scientific committee which met in January 1953 headed by Howard P. Robertson.  The Panel arose from a recommendation to the Intelligence Advisory Committee (IAC) in December 1952 from a Central Intelligence Agency (CIA) review of the U.S. Air Force investigation into unidentified flying objects, Project Blue Book.  The CIA review itself was in response to widespread reports of unidentified flying objects, especially in the Washington, D.C. area during the summer of 1952.

Kelley Blue Book: Kelley Blue Book is an Irvine, California-based vehicle valuation and automotive research company that is recognized by both consumers and the automotive industry.  The company is part of Cox Automotive, a unit of Atlanta, GA-based Cox Enterprises.

Supporting paragraphs: Kelley Blue Book Cox Enterprises
Answer: James M. Cox