[2] Jok represented the South Sudan national team in the 2023 FIBA World Cup and the 2024 Summer Olympics.

When Jok was three years old, his father died as a general for the Sudan People's Liberation Army during the Second Sudanese Civil War.

He drew the attention of Mike Nixon, who wanted to create a fourth-grade Amateur Athletic Union (AAU) team at the time.

[3] Jok was reluctant to play basketball at this point in his life, but he made the all-tournament team at the fourth-grade AAU state championship.

In his sophomore year, Jok averaged 18.5 points and seven rebounds, earning second-team all-state and all-conference honors.

[6] He tied a freshman record by scoring 10 or more points and shooting 80 percent or more in a first-round NCAA tournament game against the University of Tennessee.

Jok showed improvement in his junior season, averaging 16.1 points in 27.7 minutes per game, while also shooting 40.2 percent on three-pointers (80 of 199).

Jok made his professional debut on 4 November, playing in only eight minutes of action and recording a single rebound in a 126–118 loss to the Agua Caliente Clippers.

[10] In the first game of the 2018–19 NBA G League season, Jok had a double-double with 19 points on 7-of-13 shooting, 10 rebounds and two assists in a 118–108 loss to the Santa Cruz Warriors.

[14] On 16 December 2023, Jok joined the Sioux Falls Skyforce of the NBA G League,[15] but was waived on 14 January 2024.

[16] On 19 March 2024, Jok signed with the Ottawa BlackJacks of the Canadian Elite Basketball League (CEBL).

[23] On 26 April 2014, Jok was arrested at 2:43 am for driving under the influence after turning on an improper lane without a safety flag.

University of Iowa athletics director Gary Barta said, "I'm very disappointed to learn about this, especially in light of the fact that Peter had a previous incident earlier this summer".

[24] Jok was incarcerated for four days at the Johnson County Jail, but his status with the team was unaffected.