John has worked with St Luke's Innovative Resources on six highly successful card-based products. 'Strength Cards' were first published in 1992 and are now available in three languages. Since then John has illustrated and designed five other card sets. All the cards convey affirming messages or ask meaningful questions in a gentle and humorous way. Their simplicity and warmth have made them popular with teachers, counsellors, psychologists and social workers. All card sets were also published as stickers.