 As a freelance illustrator he has worked for clients such as Orange UK, Lavazza, Sony PSP, RCA Records, Starbucks, United Airlines, Newsweek, Wired, Irish Times, "The Guardian", Creative Review, "New York Times", Kinder and "The Telegraph".Jeffers artwork consists of figurative painting executed on either canvas or three-dimensional objects, both found and made.His solo show Additional Information, (Belfast December 2006) studied the balance between form and content by drawing parallels between the arts and sciences, in which figurative oil paintings were over laid with mathematical equations.