In the early 1930s, Hogg worked on a collection of her father's papers and speeches with his biographer, historian Robert C. Cotner; she became a guardian of his place in history, often writing to clarify or refute articles published about her father. According to Bernhard, "the very fact that Ima had been burdened with a name that made a lifetime of explanations necessary also made her anxious to defend her father from all detractors. By doing so, she defended herself as well, and she did so with considerable skill and unfailing politeness."