In 1976 he helped Ármann break ÍR and KR twenty year monopoly in the national championship by beating KR 84–74 in the championship clinching game.[7][8][9]
In September 1977, Jón left Ármann and signed with rivals KR.[10]
Icelandic national team
From 1968 to 1984, Jón played 120 games for the Icelandic national team.[11] He was the first Icelandic player to play over 100 games for the national team.[12][13]
Coaching career
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 December 17, 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.[17] After the season, he was named the Úrvalsdeild karla Coach of the Year.[18]