Born in Windhoek, Risser started his senior career with SpVgg EGC Wirges in 1999 and moved to Borussia Dortmund's reserve team in 2003, spending two seasons with the club in the German third division.

In April 2006, he moved to Icelandic first-division side Breidablik for three months, before returning to fourth-division football in Germany and signing with Bonner SC of Oberliga Nordrhein, where spent the entire 2006–07 season.

[4] He made a goalscoring debut for Swindon, netting the club's second goal with a 30-yard strike against Crewe Alexandra in a 3–0 win at The County Ground on the opening day of the season.

[6] He scored his second goal for the club in a 1–1 draw against AFC Wimbledon in the Football League Trophy on 8 November 2011, a game in which Swindon went on to win 3–1 on penalties.

[15] Risser scored his first goal for Stevenage in a 1–1 draw against Doncaster Rovers at the Keepmoat Stadium on 22 September; netting with a glancing header from a Filipe Morais cross.