Diagrammets oprindelige format blev udviklet af Henry L. Gantt (1861- 1919) i 1910 (se Work, Wages and Profit af H. L. Gantt, publiceret af Engineering Magazine, NY, 1910).
The initial format of the chart was developed by Henry L. Gantt (1861-1919) in 1910 (see Work, Wages and Profit by H. L. Gantt, published by The Engineering Magazine, NY, 1910).