His father is Norwegian and his mother is Ugandan. His mother, a member of the Lango people, had escaped to Kenya as a refugee during Idi Amin's reign in Uganda. Ertzgaard's father worked for the development agency Norad, and the family lived in Kenya and Zambia before they moved to Norway when Ertzgaard was nine.
His only major medal was the gold in 200 meters at the 1999 European U23 Championships. He competed at the 2000 Olympic Games in Sydney without advancing to the second round. The biggest success of his career was reaching the semifinals of the 1999 World Championships in Seville.
|1994||World Junior Championships||Lisbon, Portugal||31st (h)||200m||22.07 (wind: +0.5 m/s)|
|8th||4 × 100 m relay||41.79|
|1998||European Indoor Championships||Valencia, Spain||29th (h)||60 m||6.80|
|European Championships||Budapest, Hungary||18th (h)||100 m||10.48|
|9th (h)||4 × 100 m relay||39.77|
|1999||European U23 Championships||Gothenburg, Sweden||4th||100 m||10.29 w (wind: +2.8 m/s)|
|1st||200 m||20.47 (wind: -0.6 m/s)|
|World Championships||Seville, Spain||13th (sf)||200 m||20.72|
|2000||European Indoor Championships||Ghent, Belgium||12th (h)||200 m||21.19|
|Olympic Games||Sydney, Australia||39th (h)||200 m||21.00|
|2001||World Championships||Edmonton, Canada||19th (qf)||100 m||10.25|
|28th (qf)||200 m||20.88|
|2002||European Indoor Championships||Vienna, Austria||7th||60 m||6.74|
|European Championships||Munich, Germany||14th (sf)||100 m||10.45|
|18th (qf)||200 m||21.14|
|2006||European Championships||Gothenburg, Sweden||34th (h)||100 m||10.62|
|13th (h)||4 × 100 m relay||40.36|
- "Barndommens by rammet av AIDS. Sprintesset Ertzgaard tilbake etter 14 år". Verdens Gang (in Norwegian). 23 November 1999. Retrieved 20 April 2017.
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