Subject matters spanned an array of interests including decorating, gardening, beauty, automotive, entrepreneurship and small business, sports, outdoor living, history, tactical, entertainment and wellness.

Harris' titles covered a variety of markets and focused on niche special interests, primarily in the United States.

[8] One of Harris Publications' first successful and long-running titles was Guitar World, which it published beginning in 1980, before selling the property to Future US in 2003.

[6] In 1983, Harris acquired the assets of the defunct Warren Publishing, including their well-known horror magazines Creepy, Eerie, and Vampirella.

A number of British creators worked for Harris on its Vampirella titles, including Grant Morrison, Gary Frank, Mark Millar, John Smith, Ian Edginton, and Malachy Coney.