Harold Arthur graduated from Albany Business College and obtained a law degree from La Salle Extension University. He began his career as an assistant to a governor and later worked as a clerk and stenographer. Arthur served in the Vermont National Guard and later held significant roles in the Vermont House of Representatives, including chief clerk and parliamentarian. During World War II, he served as a Judge Advocate General, reaching the rank of lieutenant colonel. He also served briefly as lieutenant governor of Vermont. Throughout his career, Arthur demonstrated expertise in legislative processes and public service.

Harold Arthur's political identity is marked by a surprising blend of fiscal conservatism with progressive social policies, particularly in education and healthcare. His military background informs a staunch advocacy for robust national defense, yet his legislative record reveals an unexpected alignment with opposing factions on environmental regulations, suggesting a strategic approach to regional economic interests. Arthur’s rhetorical style is notably measured and principled, avoiding the common political buzzwords, which invites deeper inquiry into his nuanced policy positions.