A four-time Icelandic Basketball Player of the Year, he won three national championships and two Icelandic Basketball Cups with Keflavík.

[1] Between 1982 and 1995, Jón played 158 games for the Icelandic national team.

[2] He coached the national team from 1995[3] to 1999 when his contract was not renewed.

[4] In 1998, he served as the head coach of the Icelandic women's national basketball team during the Promotion Cup.

[5] In 2001 Jón was voted to the Icelandic team of the 20th century in basketball as a player.