Shelvin Bernard Mack Jr. was born in April 22, 1990 who last played for Hapoel Jerusalem of the Israeli Premier League and the FIBA Champions League. He played college basketball for the Butler Bulldogs.
On June 23, 2011, Mack was selected with the 34th overall pick in the 2011 NBA draft by the Washington Wizards. On December 9, 2011, he signed with the Wizards following the conclusion of the NBA lockout.
In July 2012, Mack joined the Washington Wizards for the 2012 NBA Summer League. On October 28, 2012, he was waived by the Wizards. On November 2, he was selected with the fourth overall pick in the 2012 NBA Development League Draft by the Maine Red Claws.
On December 25, 2012, Mack re-signed with the Wizards,but was again waived by the team on January 7, 2013.
On January 17, 2013, Mack signed a 10-day contract with the Philadelphia 76ers. On January 28, he signed a second 10-day contract with the 76ers.He was not retained by the 76ers following his second 10-day contract, and on February 7, he was reacquired by the Red Claws. He went on to play for the Futures All-Star team in the 2013 NBA D-League All-Star Game.
On March 6, 2013, Mack signed a 10-day contract with the Atlanta Hawks. On March 16, he signed a second 10-day contract. On March 26, he signed a two-year, non-guaranteed deal with the Hawks.
In 2013–14, he played 73 games, averaging 7.5 points, 2.2 rebounds and 1.7 assists per game.
On August 22, 2014, Mack re-signed with the Hawks to a three-year, $7.3 million contract. On December 17, 2014, he scored a career-high 24 points on 6-of-6 from three-point range off the bench in a 127–98 win over the Cleveland Cavaliers.
On February 18, 2016, Mack was traded to the Utah Jazz in a three-team trade involving the Hawks and the Chicago Bulls. On March 11, he scored a career-high 27 points in a 114–93 win over the Washington Wizards.
On July 9, 2017, Mack signed with the Orlando Magic.
On August 7, 2018, Mack signed with the Memphis Grizzlies.
On February 7, 2019, Mack was traded to the Atlanta Hawks in exchange for Tyler Dorsey. He was waived by the Hawks the following day.
On February 10, 2019, Mack was claimed off waivers by the Charlotte Hornets.
On July 25, 2019, Mack signed a two-year deal with Olimpia Milano of the Italian Lega Basket Serie A and the EuroLeague. He appeared in 19 games for Milano, averaging 5.8 points, 2.4 rebounds, and 2.4 assists in 18 minutes per game.
On January 16, 2020, Mack parted ways with Milano to join Hapoel Jerusalem of the Israeli Premier League for the rest of the season.