Diagnosed with cerebral palsy when he was young, he played a variety of sports and graduated from East Anchorage High School in 1999.

[4] As a youngster, he played and participated in a number of sports including American football, baseball, ice skating, cycling and weight training.

[3] Johnson made his first USPNT after a tryout in Carson City, California in August 2003 with fellow Alaskan soccer player Jason Slemons.

[4] In October 2003, Johnson traveled with the team to Buenos Aires, Argentina to play with the USPNT at the Paralympic World Championships.

[11] He participated in the 2012 BT Paralympic World Cup, where the United States won a bronze medal.

[6] He was invited to a national team training camp that took place from April 29 to May 6, 2015, in Carson, California.

This camp was in preparation for the 2015 Cerebral Palsy Football World Championships in June of that year in England.

[19] Participating at the Cerebral Palsy Football World Championships, Johnson was in goal for the US's game 3–0 victory against Venezuela[20] and the team's 10–0 loss to England.

[22] He was part of the 14 man squad that represented the United States at the 2015 Parapan American Games in Toronto.

[24] Johnson took part in a national team training camp in Chula Vista, California in early March 2016.