[3][2] In 1997, Siem founded the website-based company Sportsprofiler (later Icons), who at one time developed web-pages up to 80 percent of top football players in Norway, England and Germany.
Siem started in 1994 the Soccer against crime project in Cape Town, South Africa and has since been involved in helping deprived communities.
His tenure coincided with the 2010 FIFA World Cup, and he was among other things responsible for the opening match at Soccer City stadium.
[4] Along with Zvonimir Boban, Siem was hired by FIFA in May of 2016 to join president Gianni Infantino's management team, specifically to become strategy advisor.
[6] In 2023, Siem became director of the executive board of the afore mentioned Vålerenga Fotball soccer team in Oslo, which was subsequently relegated from the Eliteserien.