He chose to stay with Glasgow in 2007, leading to the club purchasing his contract from Edinburgh.
Ksiezak started his British career with the Edinburgh Monarchs in 2005. He agreed terms to be the Belle Vue Aces number 8 for the 2008 season. Ksiezak has Polish and Australian citizenship.
On 6 May 2008 he gained a Polish speedway licence (Licencja "Ż") at Toruń.
Since then he has taken part in the Polish Championships as a Polish domestic rider (as Robert Księżak). Ksiezak finished second in the Gillman Division 1 Solo Championship at his home track in Adelaide, the Gillman Speedway in 2009 and 2012.
Individual U-21 World Championship
2007 - Ostrów Wielkopolski, Edward Jancarz Stadium - Reserve - Did not ride