 In 1978 he started working at the newly opened Rudy's Music Stop, owned by luthier Rudy Pensa, where he met members of Dire Straits, first David and then Mark Knopfler.He visited the Knopflers in London, and after David (and then Hal Lindes) left the band, Sonni was asked to join the band for the 1984 recording sessions for "Brothers in Arms" and the subsequent tour.Jack accepted, and played guitar synthesizer on "The Man's Too Strong."