Immediately after his study at the "Joop van den Ende Academie" debut at the Berlin Theater des Westens in 2006, playing the role of Alfred in the musical remake of the horror-comedy film Dance of the Vampires.

In 2002, Klaws was encouraged by his family and friends to audition for the debut season of the reality television series Deutschland sucht den Superstar.

Although he was considered as one of the more inconspicuous top ten finalists at the very beginning of the show, he was able to boost his popularity constantly with standout performances of Robbie Williams' "Angels" or Michael Sembello's "Maniac".

Immediately after winning DSDS, Klaws was signed to a record deal with Sony BMG, while jury member Dieter Bohlen was consulted to produce his debut album on the company.

At the end of a year he entered the top of the charts again with "Free Like the Wind", the soundtrack to the German TV movie Hero of the Gladiators [de].

[2] A musical continuation of his commercially successful debut, he worked with a small number of new collaborators on the album apart from Bohlen, including Yak Bondy, Ingo Politz, and Brix.

[2] Also in 2004, Klaws was cast in a supporting role in an episode of the German television series Das Traumhotel, filmed in Bali and broadcast the following year.

[2] In March 2005, he recorded and released the duet "All (I Ever Want)", an English version of the 3 Musketiers theme song featuring vocals from German singer Sabrina Weckerlin.

[2] Following the conclusion of his management and recording contract, he signed a new deal with Cruiser Entertainment which released his fourth album Was willst du noch?!

[2] In 2010, Klaws took over the role of Tarzan in the Neue Flora Hamburg production of the same-titled musical based on the Walt Disney Animation Studios 1999 film of the same name.

[2] The same year, Klaws played the role of Ranger in the musical version of the German comedy film Der Schuh des Manitu at the Freilichtbühne Tecklenburg.

[2] In December 2017, he originated the role of Sam in the German version of Ghost the Musical, based on the hit 1990 romantic fantasy thriller film of the same name, for which he returned to the Theater des Westens stage in Berlin.