MRCS 1835; LSA 1836; MD Edin 1837; FRCP Edin 1845.
Lees was practicing in Ashton-under-Lyne, probably from the 1830s to the 1880s. In 1847, Lees applied for the position of physician at MRI, but later withdrew his application. He was a member of MMS and BMA and a justice of the peace for Lancashire.