 At the 2004 Summer Paralympics in the SH2 Standing Air event, Johnson shot a perfect 600 out of 600 points in the preliminaries and then equalled the world record for a gold medal in the finals with 704.3.Johnson later became the first New Zealand world champion, when in July 2006 he won the gold medal in the SH2 Prone Air event at the IPC World Championships in Switzerland, shooting 600 out of 600 points In 2007, Johnson attended the Jikji Cup in South Korea, competing in and winning four events