August Emanuel Gerspacher was born 28 July 1858 in Rußwihl, a small town near Waldshut (Germany). He studied with Engelbert Humperdinck and later worked as a music teacher in Karlsruhe. He died on 6 March 1930 in Karlsruhe.
From the Violin concerto by Gerspacher only one movement - the "Poco lento" - survived in piano reduction. The published score mentions orchestral parts, but the archive of the Meistersingerverlag does not exist anymore. I have no information if Gerspacher ever composed other movements of the violin concerto and I don't know where the manuscripts of him are archived nowadays.