In March 2014, Stefan premiered a new violin concerto, Jauchzende Bögen [Jubliant Arcs], written for him by the American composer David Fulmer and commissioned by the Internationales Musikfestival Heidelberger Frühling (Heidelberg, Germany) and the ProMusica Chamber Orchestra of Columbus (Ohio), Stefan gave the world premiere in Germany with the Deutsche Kammerphilharmonie Bremen, conducted by Matthias Pintscher. Stefan also performed Mozart's Turkish violin concerto on the program. The concert received a rave review from German newspaper Morgenweb: "Somehow [Jackiw] combines the best of all worlds. At this concert in Heidelberg, he succeeded equally with contemporary music and with Mozart. Especially with Mozart, whose fifth violin concerto one had not heard sound so fresh in ages, nor had one heard for a long time its breadth of tone so fully exploited in this way. His playing looks incredibly spontaneous, as if born of the moment."