Dirk Schäfer (Rotterdam November 25, 1873–Amsterdam February 16, 1931).
Schäfer was a Dutch concert pianist and composer of piano pieces.
For example ("Sonate Inaugurale" Op. 9) and chamber music, such as his distinctly Brahmsian piano quintet in D flat (Opus 5) and his sonatas for violin and piano, Op. 11 and a "Javanese Rhapsody".
He recorded performances of works by Chopin before his death.
There are many fine performances available including many on Youtube eg;
https://www.youtube.com/watch?v=2aDnOLIlnF8
A discussion about him here;
http://www.unsungcomposers.com/forum/index.php?topic=4021.0
Works with opus number
Op. 1 – Zwei Lieder for mixed choir and orchestra
Op. 2 – Zwei Gesänge for mixed choir
Op. 3 – Eight Etudes for piano
Op. 4 – Sonata for Violin and Piano No. 1 in D major
Op. 5 – Piano Quintet in D flat major
Op. 6 – Sonata for Violin and Piano No. 2 in F major
Op. 7 – Rhapsodie Javanaise [Javanese Rhapsody] for orchestra
Op. 8 – Suite Pastorale in E major for orchestra (or piano solo)
Op. 9 – Sonate Inaugurale
Op. 10 – Three piano pieces
Op. 11 – Two sonatas for violin and piano
Op. 12 – Six piano pieces
Op. 13 – Sonata for Cello and Piano in C major
Op. 14 – String Quartet in ?
Op. 15 – Eight piano pieces
Op. 16 – Four songs
Op. 17 – Five Interludes for piano
Op. 18 – Toccata for piano
Op. 19 – Suite ‘In de stilte’ [In the silence]