A Rotarian since 1974, Stenhammar served on the RI Board of Directors in 1996-98. He has also served RI as district governor, committee member and chairman, and task force general coordinator.

• 施当恒自1974年成为扶轮社员，在1996-98年担任国际扶轮理事。他也在国际扶轮担任了地区总监，委员会委员及主委，和特别工作小组的总协调人。