Mark W. Hennessy works for Hennessy Automobile Cos. in Atlanta, Georgia. He has been married to Paula B. Hennessy since June 1981 and the couple has 2 grown children, Robert and Molly Wogan (Hennessy). They have also been blessed with 5 grandchildren.

Mr.Hennessy attended Marist School in Atlanta, A graduate of UNC-Chapel Hill '76, and received an MBA from Georgia State University in 1981. Mr. Hennessy joined then Hennessy Cadillac shortly after graduation in May of 1976. Throughout his career, he has focused his efforts and attention on the Cadillac, Jaguar, and Land Rover franchises. Mark has been active in the advisory associations or Dealer Councils for each of the manufacturers and has held the title of Chairman of each of the Councils at least once.

Mr. Hennessy has served on the board of Trustees for the Marist School in Atlanta and is a member of the Buckhead Coalition. He served on the first BRAC Commission for Fort McPherson. He was a member of the North Fulton CID for over 8 years. Mark was also active in the Chattahoochee Hill County Alliance and the movement to incorporate the City of Chattahoochee Hills. Mr. Hennessy had the pleasure to serve on the Board of the Technical College System of Georgia from April 2020 to the spring of 2023, when he was appointed to serve on the Board of Natural Resources. Lastly, Mr. Hennessy is a holder of a Lifetime Sportsman's License.