A 1901 graduate of the University of Minnesota College of Law, Harry Arthur Hageman practiced for the next three decades in St. Paul, developing an expertise in insurance law. He died on August 16, 1932, aged fifty-six. In memorial proceedings for the Ramsey County Bar Association the following year, he was recalled:
"The records of the Supreme Courts and the Federal Courts of the Northwest disclose Mr. Hageman's ability in this discerning important points pertaining to insurance law and an examination of the decisions in the various cases in those Courts involving questions of law will convince any lawyer as to the thoroughness of Mr. Hageman's attention to the interests of his client and his grasp of the difficult principles surrounding that phase of the law. We do not hesitate to say that Mr. Hageman has assisted the Court in a refinement and clarification of the law on various insurance questions, and his work represents a real contribution to our jurisprudence."