Hastings gave instructions to his manservant, Simpson, to pay the bills and proceed forthwith to Montreal. While in Montreal, Simpson would wait for his master to wire him in coded language. The message would contain further instructions. (TNG: "The Big Goodbye")
This character was only mentioned in writing.
The pages seen in the episode were actually from the detective novel, The Listening Man, by author John A. Moroso. This novel was published in 1924. Information on Russell Hastings was from page 164.