Mr. Robinson is described as a Financial power-player who knows about all the people in the world of banking and high-finance. He appears to operate his own private intelligence service and is often called upon to supply information about what is going on behind the scenes.
In At Bertram's Hotel, Mr Robinson is described as being a "fat man and very well dressed". He has a yellow face, dark, sad-looking eyes, and a large, generous mouth. He smiles frequently, displaying overlarge teeth. His English is perfect and without accent, but he is not an Englishman, and it is not known what his nationality is.