Since 2011 Klussmann has been the founding chairman of the German Quizzing Association (Deutscher Quiz-Verein).
[3] At the 2017 European Quizzing Championships in Zagreb he was the second German to win a medal in an international quiz competition.
He won the German Quizzing Championship in 2013, 2017, 2020 and 2022 in the double competition (each with Sebastian Jacoby) and in 2019, 2020, 2021, 2022 and 2023 in the team competition (each with Sebastian Jacoby, Roland Knauff and René Waßmer).
Since 2013 Klussmann has appeared regularly in the role of a "chaser" in the ARD quiz programme Gefragt – Gejagt, the German adaptation of the British game show The Chase, with the programme being broadcast from 2012 to 2015 on NDR and from 2015 on Das Erste.
Klussmann lives in Berlin and works as a consultant with a focus on memory, education, general knowledge and geopolitics as well as a speaker and presenter.