Gulley attended Central High School in Beaumont, Texas, where he averaged 18 points, 6 rebounds, 3 assists and 2 blocked shots a game in his senior year. Gulley was also the co-MVP of Texas District 20 in Class 4A and also earned all-conference honors as a junior and was a three-year starter for the Jaguars. Gulley started his college basketball at Highland Community College in Highland, Kansas, where he averaged 23.1 points, 5.8 rebounds, 2.3 assists and 2.2 steals per game in his sophomore year. Gulley earned NJCAA Division II first-team All-America honors in 2010-11 after helping Coach Scotties to a 22-14 record and Region VI title. On April 15, 2011, Gulley signed national letter of intent to attend Missouri State. In his senior year, he averaged 14.3 points, 6.3 rebounds, 1.5 assists and 1.5 steals per game, earning a spot in the second-team All-Missouri Valley Conference.
On August 5, 2014, Gulley signed his professional contract with the Musel Pikes of Luxembourg's Total League. On December 8, 2017, Gulley recorded a double-double of 11 rebounds and a career-high 50 points, shooting 18-24 from the field and 9-of-10 from three-point range, along with eight steals and two assists in a 106–74 win over US Heffingen. In 27 games played during the 2017-18 season, he averaged 25.9 points, 8.7 rebounds, 3.0 assists and 2.2 steals per game, while shooting 42.2 percent from three-point range.
On July 17, 2019, Gulley signed a one-year deal with Hapoel Gilboa Galil of the Israeli Premier League. On October 27, 2019, Gully recorded 26 points, 5 rebounds, 5 assists and 3 steals, including a three-pointer at the buzzer to give Gilboa Galil a 91–89 overtime win over Maccabi Ashdod. On December 1, 2019, Gulley recorded 32 points, while shooting 12-of-24 from the field, along with eight rebounds, nine assists and five steals for 42 PIR, leading Gilboa Galil to a 115–106 double overtime win over Ironi Nes Ziona. Two days later, he was named co-Israeli League Round 8 MVP, alongside his teammate Justin Tillman. On January 18, 2020, Gulley recorded a double-double of 30 points with a career-high 16 rebounds, while shooting 11-of-17 from the field, along with five assists for 51 PIR in a 96–80 win over Ironi Nes Ziona. He was named the Israeli League Round 16 MVP. On January 31, 2020, Gulley was named Israeli League Player of the Month after averaging 19.4 points, 8.4 rebounds, 5.4 assists and 1.6 steals in four games played in January. On the season he averaged 18.7 points, 5.9 rebounds, 4.3 assists and 1.8 steals for Hapoel Gilboa Galil.
Darüşşafaka (2020–present)
On July 26, 2020, he has signed with Darüşşafaka of the Basketball Super League.
Personal life
He is the son of former basketball player James Gulley who played college basketball for the Lamar Cardinals. He has also played for Maccabi Rishon LeZion in Israel, where he was leading the Israeli League in rebounds for three consecutive years.
