In 2001, Jón was named as one of the twelve best Icelandic men's basketball players of the 20th century.
[4] In 1975, Jón led the league again in scoring with 306 total points, passing Kolbeinn Pálsson in the last game of the season.
[12][13] Jón coached KR men's team from 1982 to 1986, leading them to the 1985 Icelandic Basketball Cup finals[14] where they lost to Haukar, 73–71.
[15] On 17 December 1997 Jón was again hired as the head coach of KR, replacing Hrannar Hólm who was fired after going 4–6 in the first 10 games.
[16] Under Jón, KR finished the regular season with ten victories in twelve games and advanced to the Úrvalsdeild finals where it lost to Njarðvík 0–3.