Tim Hartnell (?-1991) was an Australian journalist, self-taught programmer and extremely prolific, bestselling author of books and magazines on computer games. His company, Interface Publications (set up with Sue North), produced titles for all of the machines in the home computer market, including Sinclair machines. Hartnell wrote several compendiums of computer games, which typically had several categories of games, with several games in each category. Wikipedia
The definitive Wikipedia entry for Tim Hartnell. Wikipedia is the biggest multilingual free-content encyclopedia on the Internet. en.wikipedia.org/wiki/Tim_Hartnell