One year later, he started working as reporter and editor for the "Radio Genève Information", and for the "Swiss Radio International" in Bern where he moderated the popular information magazine "Echo der Zeit" from 1986 to 1992, in the beginning as correspondent, among others during the revolutions in Slovakia and Romania in 1989, later as chief editor of "Echo der Zeit". Starting in 1993 Stephan Klapproth became the anchorman of the evening news show "10vor10" of the Swiss national television Schweizer Fernsehen SRF. On occasion of special broadcasts he travelled many countries, among others Klapproth hosted the live special broadcast of "10vor10" on occasion of the 9-11 terror attacks, and the US presidential elections in 1992 and 2012. While moderating "10vor10", in 2002 he participated also some episodes of "Sternstunde Philosophie" and "Reporter" for Schweizer Fernsehen SRF. From 2002 to 2004 Klapproth was also host of the entertainment show "QUIZ today", a quiz on current political events, but the audience rating statistics were low, therefore the show was cancelled by the Swiss television channel SRF 1. In 2005 Klapproth was awarded with the Swiss TV Award as the most popular television presenter. The prize money of CHF 20,000, he stated to donate to the charity "Goutte d'eau" which is fighting against child trafficking and prostitution in Asia, those "exemplary orphanages have impressed me on a visit to Cambodia". For 21 years Stephan Klapproth commonly was called "Mr. 10vor10", and he left the daily crew on 4 September 2015, moderating in all about 2000 shows. He still moderates "10vor10" specials, and the cultural program "Sternstunde Philosophie" since January 2015.