[2] He has been labelled as one of the major Australian artists of his generation and 'one of Australia's best kept secrets'[3] by art historian and curator Mary Eagle.
Christmann rose to prominence with his inclusion in the landmark exhibition The Field at the National Gallery of Victoria in 1968.
[3] Throughout his different phases Christmann has maintained a fascination with the world around him, feeding off contemporary life, with his more recent works incorporating a ‘'tag" graffiti style that is drawn across his paintings, sometimes in almost obsessive repetition.
Since then he has held over 40 solo shows and participated in over 70 group exhibitions throughout Australia and overseas.
A posthumous retrospective of his life's work entitled Gunter Christmann: Now and Then was shown in 2014 at Heide Museum of Modern Art.