Eliazer Isaäc Horneman (also called Leo) was a son of Abraham Horneman and Saartje Kaufman. Leo Horneman was a musician, although he was registered in 1941 as a store clerk. From 1930 he played as a pianist in larger and smaller bands throughout the country. He also arranged music and gave piano lessons at his home in Bilderdijkstraat 2 in Utrecht, where he lived with his parents. In 1934 Leo foun…