Johnson playing for Louisville
|No. 29 – Iowa Wolves|
|League||NBA G League|
|Born||August 7, 1996|
|Listed height||6 ft 9 in (2.06 m)|
|Listed weight||230 lb (104 kg)|
|High school||Ypsilanti (Ypsilanti, Michigan)|
|NBA draft||2017 / Undrafted|
|2017–2018||Windy City Bulls|
High school career
- Produced a triple double of 20 points, 10 rebounds, and 11 assists in the Class A district title game. He grabbed double-digit rebounds in 11 games as a senior.
- A finalist for the Hal Schram Mr. Basketball award in Michigan, Johnson was a first team all-state selection and was the Ann Arbor News Washtenaw County Player of the Year. He was ranked No. 55 nationally by 247Sports.com, 56th by Rivals.com, 62nd by Scout.com and was among the nation’s top 25 power forwards by ESPN.
- Averaged 13.8 points and 8.5 rebounds as a junior in helping Ypsilanti to a 20-5 record and the school’s first regional championship since 1981. He averaged 19.7 points and 15.3 rebounds in three district games before Ypsilanti reached the state quarterfinals, where Johnson totaled 15 points and 12 boards. He was a first-team all-county selection as a junior.
In 2013, he attended the Lebron James Skills Academy and Adidas Super 64. Johnson attended the Pangos All-American Camp in 2014 and was awarded the Mario Ellie Award and was also named to the "Cream of the Crop" Top 30.
- Produced a double-double for the winning White team in the 2014 Kentucky Derby Festival Basketball Classic all-star game, totaling 14 points, 10 rebounds and two assists.
- Played quarterback early in his prep career.
He joined the Louisville Cardinals men's basketball team for the 2014-15 season. During his three-year tenure with the Cards, Johnson made a total of 88 appearances, starting in 22 games his sophomore season and in 26 as a junior. Johnson averaged 5.2 points and 3.8 rebounds a contest during his Louisville career. His best season came as a junior (2016–17) when he scored 8.0 points a game, while scooping up 5.8 rebounds in 20.5 minutes per game. His per 40 minutes numbers were 15.6 points and 11.3 rebounds. Johnson finished 7th in the ACC and 102nd nationally in offensive rebounds per game.
Windy City Bulls (2017–2018)
After going undrafted in the 2017 NBA Draft, Johnson signed a training camp deal with the Chicago Bulls. He was waived on October 14 as one of the final preseason cuts. On November 4, 2017, Johnson was included in opening night roster of the Windy City Bulls. On March 24, 2018, the Chicago Bulls announced that they had signed Johnson, but was waived on the next day.
On October 20, 2018, the Iowa Wolves announced that they had acquired the returning rights to Johnson and Jarell Eddie from the Windy City Bulls for the returning rights to JaKarr Sampson and the draft rights to the No. 38 overall pick in the 2018 NBA G League Draft, Mike Amius.
Iowa Wolves (2019)
Hapoel Holon (2019)
Second stint with Iowa Wolves (2019–present)
His mother Janetta played basketball at the University of Wisconsin, is the first women to lead in the nation in blocked shots, men and women at the same time during her tenure at Wisconsin,  she still holds the single-season record for blocked shots at Wisconsin. With 130 Blocks in one season. She also spent four years playing professionally in Portugal.
- "Ex-Ypsilanti star Jaylen Johnson declares for NBA draft". Detroit News. Retrieved 2017-09-30.
- "Reports: Ypsilanti's Jaylen Johnson earns notice at LeBron James Skills Academy". AnnArbor.com. Retrieved 2017-09-30.
- "Q&A with UNLV target Jaylen Johnson, a 4-star forward in the class of 2014". LasVegasSun.com. 2013-07-25. Retrieved 2017-09-30.
- "Pangos All-American Camp Recap". Cal-Hi Sports. Retrieved 2017-09-30.
- "California Dreamin': Johnson earns Pangos Camp MVP; Mudiay a magnificent talent - Bluestar Media". www.bluestarmedia.org. Retrieved 2017-09-30.
- "Jaylen Johnson - 2014-15". Retrieved 2017-09-30.
- "Looking Ahead At Louisville Basketball's 2017-18 Roster". The Crunch Zone. 2017-03-23. Retrieved 2017-09-30.
- "Jaylen Johnson College Stats | College Basketball at Sports-Reference.com". College Basketball at Sports-Reference.com. Retrieved 2017-09-30.
- "NCAA Statistics". web1.ncaa.org. Retrieved 2017-05-26.
- "Conference Stats". CBSSports.com. Retrieved 2017-09-30.
- "Offensive Rebounds Per Game | DI Men's Basketball Statistics - NCAA.com". NCAA.com. Retrieved 2017-09-30.
- "Jaylen Johnson will not return to Louisville". Card Chronicle. 2017-04-24. Retrieved 2017-05-26.
- "Former Louisville basketball player Jaylen Johnson signs training camp deal with Chicago". USA TODAY. Retrieved 2017-10-03.
- "Bulls waive Jaylen Johnson and Bronson Koenig". NBA.com. October 14, 2017. Retrieved October 14, 2017.
- "Windy City Bulls Announce Opening Night Roster". NBA.com. November 4, 2017. Retrieved November 4, 2017.
- "BULLS SIGN JAYLEN JOHNSON". NBA.com. March 24, 2018. Retrieved March 24, 2018.
- "BULLS SIGN CJ FAIR; WAIVE JAYLEN JOHNSON". NBA.com. March 25, 2018. Retrieved March 25, 2018.
- Burrell, Randi (October 20, 2018). "Iowa Receives Returning Player Rights of Jaylen Johnson and Jarell Eddie in Trade with Windy City". NBA.com. Retrieved October 20, 2018.
- Nutting, Seth (January 11, 2019). "Wolves Add Jaylen Johnson to Roster". NBA.com. Retrieved January 11, 2019.
- "Fourth Annual Pacers Summer League Primer". IndyCornrows.com. July 1, 2019. Retrieved September 4, 2019.
- "Jaylen Johnson joins Hapoel Holon". Sportando. September 4, 2019. Retrieved September 4, 2019.
- "ג'יילן ג'ונסון שוחרר מחולון, זר חדש להפועל ת"א". ONE.co.il (in Hebrew). November 2, 2019. Retrieved November 2, 2019.
- Nutting, Seth (November 20, 2019). "Wolves Acquire Brandone Francis and Jaylen Johnson". NBA.com. Retrieved November 20, 2019.
- "Jaylen Johnson's mother Janetta provides example and support for Ypsilanti basketball star". MLive.com. Retrieved 2017-05-26.