Richardson played four years of basketball for Blue Valley NorthwestHigh School, finishing with an overall record of 94–6. In all four seasons of high school, he helped his team reach the Kansas Class 6A State Championship game, winning two consecutive titles in his final two years. As a junior, he averaged 12.8 points, 4.0 rebounds, and 3.8 assists per game, and as a senior, he averaged 11.4 points per game, earning first-team All-State honors in both seasons. Richardson was deemed a three-star recruit by recruiting service Rivals but was not rated by ESPN or 247Sports. He gained limited interest from major NCAA Division I programs, primarily receiving offers from mid-major colleges like Indiana State and UMass. He committed to play for Loyola on September 29, 2013 under head coach Porter Moser.
College career
As a freshman for Loyola in the 2014–15 season, Richardson averaged 4.2 points, shooting.381 from the field, in 20 minutes per game. His best game of the season was a season-high 15 points, going 5-of-5 from the three-point line, in a win over Indiana State at the 2015 Missouri Valley Conference Tournament quarterfinals. He accumulated a team-high 33 steals. In his sophomore campaign, Richardson averaged 4.9 points, with a.402 field goal percentage, in 23.8 minutes per game. He was named to the Honorable Mention Missouri Valley Conference Scholar-Athlete Team and made the MVC Honor Roll. He scored a season-best 21 points against Toledo at the Great Alaska Shootout on November 27, 2015, shooting 7-of-8 from the field. Richardson averaged a career-high 8.3 points, 2.9 assists, and 1.3 steals in 31.8 minutes per game in his junior season, starting in all 32 games. He garnered First Team MVC Scholar-Athlete Team honors, being named MVC Scholar-Athlete of the Week on January 10, 2017. Richardson posted season-bests of 22 points and 8 assists on December 29, 2016 in a loss to Drake. As a senior, he averaged 6.9 points, 3.8 assists, and 1.2 steals in 31 minutes per game, en route to MVC Defensive Player of the Year and All-Defensive Team accolades. On March 24, 2018 against Kansas State, he scored a career-high 23 points, shooting 6-of-7 from the three-point line, to lead Loyola to the Final Four of the 2018 NCAA Tournament. Richardson was named MVC First Team Scholar-Athlete and to the Division I-AAA Scholar-Athlete Team. Along with Loyola teammate Clayton Custer, he also won the Kansas City Sports Commission Sportsmen Of The Year award.
Professional career
On July 20, 2018, Richardson signed a contract with MKS Dąbrowa Górnicza of the Polish Basketball League.