Career
In his three-year career at Nevada, Johnson averaged 14.3 points, 3.7 rebounds and 4.4 assists in 101 games. Johnson was selected by the Portland Trail Blazers with the 34th overall pick in the 2010 National Basketball Association draft. On August 2, 2010, he signed with the Trail Blazers after averaging 11.6 points and 4.2 assists in five summer league games.
On January 28, 2011, he was assigned to the Idaho Stampede of the National Basketball Association Development League.
He was recalled on February 22, 2011, then reassigned on January 4, 2012, and recalled again on January 15, 2012. On February 27, 2012, he was waived by the Trail Blazers.
He signed a ten-day contract with the New Jersey Nets on April 9, 2012. On April 20, he signed with the Nets for the rest of the season.
On September 29, 2012, Johnson signed with the Orlando Magic.
However, he was later waived by the Magic on October 23, 2012 after appearing in five preseason games. In December 2012, he joined Kazakh powerhouse team British Columbia Astana. After scoring 13 points in his debut for Astana on December 16, he was ruled out for the rest of the season with a serious knee injury.
In March 2014, after passing a tryout period, Johnson signed with the Spanish team Central Bank Valladolid for the rest of the season.
On July 7, 2014, Johnson joined the Los Angeles Clippers for the 2014 National Basketball Association Summer League. On July 29, he signed with Le Mans Sarthe Basket of France for the 2014-2015 season.
On October 29, 2014, he was waived by Le Mans after appearing in just five games. On April 2, 2015, he was acquired by the Austin Spurs of the National Basketball Association Development League.
On August 14, 2015, Johnson signed with Göttingen of the German Basketball Bundesliga.
On September 15, 2015, he parted ways with Göttingen before the start of the season.