Emil Robert-Hansen was a Danish cellist and composer who wrote two symphonies, concertos for cello and for piano, chamber music and also stage works, according to his Wikipedia entry (https://en.wikipedia.org/wiki/Robert_Emil_Hansen).
A performance of his 1910 Trio for Flute, Violin and Cello in 3 movements is on Youtube (https://youtu.be/o6n4L8im2-4?feature=shared) (link to first movement).