[1] Siegelaar qualified for the 2008 Summer Olympics in Beijing with the Dutch eights forming a team with Olaf van Andel, Jozef Klaassen, Meindert Klem, David Kuiper, Diederik Simon, Rogier Blink, Mitchel Steenman and cox Peter Wiersum.

[1] Siegelaar rowed in the men's eight during the 2009, 2010 and 2011 World Championships finishing 3rd, 4th and 6th respectively, before competing at the 2012 Summer Olympics in London.

At the 2016 Summer Olympics in Rio de Janeiro he was part of the men's eight team that won a bronze medal.

During his rowing career, Siegelaar pursued a degree in Mechanical Engineering between 2009 and 2013 at the University of California, Berkeley, where he competed for the Cal Golden Bears.

He rowed three times (2009, 2010, 2011) in the Varsity eight during the IRA National Championships and won silver, gold and bronze respectively.