Upon turning pro, he played in Australia and Bulgaria, making a name for himself in the State Basketball League (SBL).

[2] As a junior, he was the District 11-4A Defensive Player of the Year and a First-Team All-East Texas selection by the Tyler Morning Telegraph.

[2][3] On November 19, 2008, Holmen signed a National Letter of Intent to play college basketball for the University of North Texas.

[2] As a senior in 2008–09, Holmen averaged 20 points and 11.5 rebounds per game in earning All-East Texas MVP honors.

[2] Specializing as a sprinter, Holmen took first place in District 14-4A in both the 400-meter dash and the 4x400-meter relay, and won his heat in the 400 at the Region II 4A Track Championships.

[4] As a sophomore in 2010–11, Holmen missed the final seven games of the season after suffering a broken hand in a loss to Louisiana-Monroe on February 19.

[5] He had gradually ascended late in the season, having scored in double figures in three of his final six games and posted a double-double with 15 points and 10 rebounds in a loss to Louisiana-Lafayette on January 27.

[5] Deprived of turning pro upon graduating from North Texas, Holmen began a youth coaching career.

[15] On December 22, 2014, Holmen signed a professional contract in Australia with the Goldfields Giants of the State Basketball League (SBL) for the 2015 season.

[19] After the Giants started the season 0–8, Holmen helped them get their first win with 43 points and 15 rebounds against the East Perth Eagles.

[23] In game one of the semifinals, Holmen had 35 points, 15 rebounds and six assists in a 116–111 overtime loss to the South West Slammers.

[38] Following the conclusion of the SBL season, Holmen moved to Bulgaria to play for Balkan Botevgrad of the National Basketball League.

[49] In November 2017, Holmen was on the verge of signing with the Hobart Chargers of the South East Australian Basketball League until he ruptured his ACL.

[58] In game one of the semi-finals against the Rockingham Flames on August 18, Holmen suffered a season-ending knee injury in the first quarter as the Hawks lost 92–73.

[59] It was later announced that Holmen would require a knee reconstruction after again rupturing his ACL and suffering a torn meniscus.

[61][62] In the grand final, the Hawks defeated the Joondalup Wolves 94–87 to win Holmen his first SBL championship.