John J. McIntyre graduated from the law department of the University of Colorado at Boulder in 1928 and was admitted to the bar the following year. He began his legal career in Wyoming, serving as county and prosecuting attorney for Converse County. McIntyre also held positions with the United States Department of Justice and the Department of Agriculture, showcasing his expertise in federal legal matters. His military service in the Wyoming National Guard and later in the U.S. Army during World War II further demonstrates his commitment to public service. McIntyre transitioned into politics, serving in both the state legislature and as a justice of the Wyoming Supreme Court.

John J. McIntyre's political career reveals an intriguing blend of local pragmatism and federal advocacy, often aligning with unexpected factions to achieve his goals. His legislative record indicates a calculated approach to balancing regional industrial interests with broader national policies. McIntyre's rhetorical style is marked by a distinctive ability to bridge ideological divides, suggesting a deeply nuanced understanding of both local and federal governance.