Gist was drafted 57th overall, in the
2008 NBA draft, by the
San Antonio Spurs. After spending a year with the
Italian League club
Biella, Gist signed a contract with the Russian team
Lokomotiv-Kuban for the 2009–10 season. Gist played for the Spurs in the 2010
NBA Summer League, but was waived on October 19, 2010. Then he played with
Partizan Belgrade during the 2010–11 season, where he won the
Basketball League of Serbia championship, the
Radivoj Korać Cup, and the
Adriatic League championship. In the summer of 2011, he signed a contract with the
Turkish League club
Fenerbahçe Ülker. Shortly afterwards, it was announced that he had a sample that tested positive for
cannabis use, while playing for Partizan. On July 7, 2012, Fenerbahçe announced that Gist would not play the next season with the club. On August 15, 2012, Gist signed one-year deal (with an option for one more season) with the
Spanish League club
Unicaja Málaga. On September 26, he won the
slam dunk contest of the Spanish League. Gist joined the legendary
Greek League club
Panathinaikos, in December 2012, as part of a trade with
Andy Panko. At the end of the season, Gist renewed his contract with Panathinaikos for two additional seasons. On March 17, 2015, Panathinaikos announced that they had agreed to terms with Gist to renew his contract for an extra two years, keeping him in Athens until 2017. On April 5, 2015, Gist again tested positive for cannabis use, for the second time in his career, after the
Greek Cup final against
Apollon Patras. Eventually, on May 12, Gist was suspended for 8 months from participating in sports events. In the end, his suspension was reduced to 6 months, and Gist was allowed to play normally, from the beginning of the season. On October 22, 2015, while competing with Panathinaikos in a
EuroLeague 2015–16 season game against
Karşıyaka, Gist made a new personal EuroLeague career single-game scoring high, with 27 points scored. On July 5, 2017, Gist signed a two-year contract extension with Panathinaikos. On July 8, 2019, Gist signed a two-year contract with Serbian team
Crvena zvezda. He averaged 7.0 points, 4.4 rebounds and 1.3 assists per game. On December 3, 2020, he signed with
Bayern Munich of the
Basketball Bundesliga. On September 25, 2021, he has signed with
ASVEL of the
LNB Pro A. The contract was extended to the end of the season on December 15. On November 4, 2022, he signed with
Bahçeşehir Koleji of the
Basketbol Süper Ligi (BSL). He also played in
Uruguay for
Peñarol and in
Indonesia for
Prawira Bandung, before ending his playing career by joining the Pro-Fit Basketball Training camp as a trainer. ==Personal life==