Marjorie Knickerbocker Pyles Honzik (born 1908, d. 2003) was a developmental psychologist known for her longitudinal research on children's mental abilities, behavioral problems, and health outcomes.
Several of her most influential papers aimed to measure growth in the mental abilities of infants over the first year of life through brain development and changes in observable behaviors.
[7] Honzik conducted a landmark longitudinal study of parenting behaviors in relation to their children's mental abilities, assessed from age 21 months to 30 years.
Honzik co-authored, with J. W. Macfarlane and L. Allen, a widely cited monograph, published in 1954 and titled A developmental study of the behavior problems of normal children between 21 months and 14 years.
These included sleep disturbances, nail biting, speech problems, lying, stealing, selfishness, shyness, and many other potentially problematic behaviors.