Hildegarde Kneeland
Hildegarde Kneeland ( July 10 , 1889 – September 15 , 1994 ) was an American home economist and social statistician , known for her time-use research . 
<triplet> Hildegarde Kneeland <subj> July 10, 1889 <obj> date of birth <subj> September 15, 1994 <obj> date of death