Although Hartman has a lengthy exhibition history beginning with a solo exhibition at Trinity College, University of Toronto, in 1972, and with many shows nationally and internationally, largely in the 1980s, it took
Painting the Bay: Recent Work by John Hartman at the
McMichael Canadian Art Collection in 1993, large-scale paintings of Georgian Bay, aerial views of thickly-painted landscape, to bring him to critical attention. In the skies of this series, Hartman painted stories about the places he depicted to achieve his concept of the land as being more than mere landscape. Hartman continued to receive national exposure with the exhibition and book
Big North: The Paintings of John Hartman, a major exhibition of Hartman's works, organized by
Museum London and the Tom Thomson Art Gallery which toured Canada between 1999 and 2002. In 2003, he began to paint aerial views of cities as living organisms. These paintings made up the exhibition and book
Cities curated by Stuart Reid which toured Canada and internationally from 2007 to 2009. In 2014, the Woodstock Art Gallery organized
John Hartman: Many Lives Mark This Place with a book by
Ian M. Thom, an exhibition of a series of 30 portraits of Canadian authors and the places that were important to them. The show travelled to the McMichael Canadian Art Gallery and elsewhere. ==Honours and awards==