Van wie was Richard Gerstl?

Richard Gerstl ([ˈʁɪçaʁt ɡɛʁstl̩]; 14 September 1883 – 4 November 1908) was an Austrian painter and draughtsman known for his expressive psychologically insightful portraits, his lack of critical acclaim during his lifetime, and his affair with Mathilde Schoenberg, wife of composer Arnold Schoenberg, which led to Gerstl's suicide.