Michael O. Varhola

Varhola adalah salah satu penulis bersama dari beberapa buku game, termasuk "Experts" (2002), "Warriors" (2003), "Tests of Skill" (2004), "Nuisances" (2005), "Experts v.3.5" (2005), "Nation Builder" (2005), "Gary Gygax's Gygaxian Fantasy Worlds Volume 6: Nation Builder" (2006), "H.G. Wells' Little Orc Wars" (2007), "Nuisances: Director's Cut" (2007), dan "City Builder: A Guide to Designing Communities" (2011).