In 1990, Mack graduated from Holden High School in Holden in Livingston Parish. In 1995, he completed his undergraduate education at Southeastern Louisiana University in Hammond. In 1999, he graduated from the historically black Southern University Law School in Baton Rouge.
Mack was elected on October 22, 2011, to succeed Walker Hines, who held the seat for one term when it was based, prior to redistricting, in Orleans Parish. In the nonpartisan blanket primary, Mack received 6,526 votes (612 percent), compared to 3,449 (324 percent) for the Democrat Lonnie Watts and 682 ballots (64 percent) for the Independent Matthew Mitchell. Mack serves on these legislative committees: (1) Administration of Criminal Justice, (2) Judiciary, and (3) Transportation, Highways, and Public Works.
On April 5, 2012, Mack voted against successful bills to authorize charter schools and to establish a school voucher program pushed to passage by Governor Bobby Jindal.
He also opposed the plan to amend teacher tenure policy.
