IGAS traces its beginnings back to 1929, when Milton N. Bunker formed The American Grapho Analysis Society.
In June 2003, Kathleen Kusta sold most of the assets of IGAS by private auction to Greg Greco.
IGAS has roughly 30 chapters, covering the United States, parts of Canada, the UK, and South Africa.
The monthly study packet is a four-page lesson that challenges members to improve their ability to analyze handwriting.
In 1957, Charlie Cole set up a series of graphology lectures, which evolved into The American Handwriting Analysis Foundation.
As a result of that study, Charlie Cole, and most of the people that attended that lecture series, were expelled from IGAS.
Handwriting Analysts of Minnesota was another group that was started as a direct result of the entire chapter being expelled for the unethical conduct of having a Holistic Graphologer lecture at their quarterly meeting.
The net result of this is that the majority of currently active organizations of handwriting analysts in the United States were formed due to this wall of separation that IGAS required its members to keep.
Perceptual and Motor Skills, 1980, 51, 220-222 Stockholm, Emilie (1983) Research Department releases findings of new reliability study Journal of Graphoanalysis , December 1983, 3-4 The Canadian Analyst published by Alex Sjoberg documented most of the history of both The American Grapho Analysis Society, and IGAS.