Henry Wallace Clark
Henry Wallace Clark ( July 27 , 1880 – April 7 , 1948 ) was an American consulting engineer , known for popularizing the work of Henry Gantt with his 1922 work "The Gantt chart; a working tool of management" . 
<triplet> Henry Wallace Clark <subj> July 27, 1880 <obj> date of birth <subj> April 7, 1948 <obj> date of death