Cyril P. Callister called Vegemite, first sold by Fred Walker & Co in 1923. Working from the details of a James L. Kraft patent, Callister was successful in producing processed cheese. The Walker Company negotiated a deal for the rights to manufacture the product, and in 1926, the Kraft Walker Cheese Company Ltd was established. Callister was appointed chief scientist and production superintendent of the new company. Between 1919 and 1927 he had 3 children (two boys and a girl) named Ian, Bill and Jean. They were the original vegemite kids. During World War II Ian unfortunately died Callister got his Doctorate from
Daddy, what did you do in the Great War? do in the Great War?" were not the only contributing factor to these recruitment figures, writing that recruiters "quickly decided that using the latest forms of mass advertising had a negative effect". The poster played on the guilt associated with not volunteering for wartime service. Karyn Burman writes that propaganda posters of the time "presented a carefully crafted image of manhood defining 'real' men as those who fought for their families, for King and Country." She cites this poster as an example of an image that was "designed to question a man's sense of self-worth". Daddy, what did you do