He painted many portrait miniatures of Queen Victoria, the Royal Family and other nobility.
He studied under local ceramic artist, George Hancock, and first devoted himself to flower-painting, but subsequently took to figure-painting, in which he was very successful.
[1] Papers relating to Haslem's career including a letter of his are held by Derby Museum and Art Gallery.
[2] Haslem was also in demand, by jewellers and art dealers, and on one occasion was employed to paint a set of enamels in imitation of Petitot, which were so successful that they appeared in the miniature exhibitions at the South Kensington Museum, in 1862 and 1865, as the work of Petitot himself.
[1] Haslem gave his collection of porcelain to Derby Museum including the Prentice Plate which he had been lucky enough to buy in London.