 In March 2019 Wittwer won 2nd place in the WC for 50m breaststroke.Wittwer works for the Swiss Military at the department for defence, public safety and sports.In 2017, Wittwer was part of a NATO mission to Kosovo for 6 months, as part of a peace supporting operation of Swisscoy, He is active for the Green Liberal Party of Switzerland and is part of the volunteer fire department.