Aller improved printing techniques by transferring them to a lithographic stone and was for a long time the only publisher in Denmark to offer illustrations in nine colours.
The company expanded fast, both through organic growth and acquisitions of numerous other printing businesses.
This contributed to bringing art into the homes of the wider population and popularizing both artists and artworks.
[3] The first art supplement was a reproduction of Otto Bache's equestrian portrait of King Christian IX of Denmark.
Aller married Laura Christiane Bierring (14 January 1849 - 9 October 1917), a daughter of merchant Lauritz Jørgen B.