In 1973, Ian began a career teaching art and social studies at MacPherson Jr. High and Booth Memorial High in St. John's.  At the same time, Ian began painting in watercolour and acrylic which quickly developed into a part time profession.  His works capture the rich colors and light patterns of Newfoundland community life and their fascinating moods.  His character and group portraits are often a social commentary on the effects of long years of hard work in fishing communities and the spirit of freedom and resolve which remains.

Ian retired from teaching in 1999 to devote himself full-time to a painting career.  In April of 2000, Ian had a very successful exhibition in Toronto entitled "Outport Moods".

Ian's painting “The Last RCMP Dog Team Patrol” was chosen by the Royal Canadian Mint for the 1994 Commemorative Silver Dollar celebrating the 25th anniversary of the RCMP Northern Dog Team Patrol. A large audience appreciates Sparke's paintings. His work can be found in corporate and private collections throughout Newfoundland and across Canada.