Gertrude is an actress and classically trained singer. She is a native German speaker, fluent in English, French and Italian, with basic Russian.

Television includes: Trust, Band of Brothers, Make German Your Business, Susannah, The Wanderer, Antigone, The Bill, FCN-news.

Theatre includes: Land of Lies, Ports of Call, Hamlet, Penthesilea,The Physicists, Boris (musical), Threepenny Opera, The Rocky Horror Show, Le 1ntendu.

Voice-overs, lip sync, dubbings for Film (Jack Gold, Steven Spielberg, John Schlesinger, Werner Herzog, Istvan Szabo a.o.), Videos, TV & Radio Commercials (Saatchi. J.W.T., B.B.H., Leo Burnett), TV Documentaries, Language Tapes (Oxford/Cambridge University Press, BBC Enterprises, O.U.), C.D.Roms (including Star Trek).

As a singer Gertrude has performed at the Kings Head, Latchmere, Barbican, French Institute, Hackney Empire, Thames TV, South Bank, New End Hampstead, Southwark Playhouse, Wimbledon Theatre, Festival Grec/Barcelona, Riverside Studios, Helsinki Music Festival, Jazz Festival/ Utrecht, Queen Elizabeth Hall, Vale of Glamorgan Festival (Radio 3), New York (B.A.M.), Torino (RAI).