Prosector's Assistant, Helper, Butcher's Assistant, and Technical assistant in the Prosectorium at the Zoological Society of London
Seasonal Staff at ZSL Whipsnade Zoo
Helper and Keeper at ZSL London Zoo
Garden Labourer and Menagerie worker at ZSL Whipsnade Zoo
Helper and later Keeper in the Reptile House
Thomson began as a Helper at ZSL London Zoo in 1869, became a full Keeper in 1871, served as a Clerk in Bartlett's office from 1873 to 1889, when he became Head Keeper, until his appointment as Assistant Superintendent in 1899
Menagerie Helper, later Keeper at ZSL Whipsnade Zoo
Temporary Helper at ZSL London Zoo
Helper in the Aquarium
Helper in the Sanatorium at ZSL London Zoo