Varney has produced numerous books, role-playing game supplements, technical manuals, articles, reviews, columns, and stories, as well as the fantasy novel Cast of Fate (TSR, 1996).

[2]: 104  From 1984 to 1986 he worked as Assistant Editor at Steve Jackson Games[1] (with Warren Spector, then Editor-in-Chief) editing Space Gamer magazine.

Varney did work for TSR from 1987 to 1992, including the "Blood Brethren" trilogy (Nightwail, Nightrage, Nightstorm) and Five Coins for a Kingdom, Wildspace for Spelljammer, Veiled Alliance for Dark Sun, and several gamebooks, the Ariya, Binsada, and Talinie realm packs for Birthright.

He also edited modules for the Ravenloft, Planescape, and Forgotten Realms settings, and was a game reviewer and news columnist for Dragon magazine.

Enspire Learning produces a computer version of Varney's multiplayer business ethics and leadership simulation, the Executive Challenge.