Henry S. Johnston demonstrated a lifelong commitment to public service, beginning with his early involvement in local governance in Noble County. He established himself as a prominent figure in Oklahoma politics, participating in the Oklahoma Constitutional Convention and later serving in the Oklahoma Senate. Johnston's career included a significant transition from private practice to public office, culminating in his election as governor. During his tenure, he prioritized education and healthcare, securing notable funding for schools and the establishment of a children's hospital. Despite his achievements, Johnston faced political challenges and was impeached, reflecting the complexities of his leadership.

Henry S. Johnston's political career is marked by an intriguing blend of progressive social policies and controversial affiliations. His advocacy for increased school funding and support for a crippled children's hospital reveals a commitment to public welfare, yet his alignment with the Ku Klux Klan during his gubernatorial campaign presents a stark ideological tension. Johnston's impeachment due to the perceived overreach of his private secretary further highlights a complex and sometimes contentious approach to governance.