Barzilla Clark began his career in agriculture and mining before becoming a licensed civil engineer. He served as mayor of Idaho Falls multiple times, during which the city constructed the Municipal Hydroelectric Plant No. 1. Clark was elected governor, during which he authorized a state tuberculosis hospital, established a pardon and parole system, and created junior college districts. After leaving office, he returned to his private interests in Idaho Falls.

Barzilla Clark's political identity is marked by an unexpected blend of regional development and public welfare initiatives. His support for infrastructure projects like the Municipal Hydroelectric Plant No. 1, paired with the establishment of a state tuberculosis hospital, reveals a calculated approach to balancing economic growth with public health. Clark's tenure also saw the introduction of a judicious pardon and parole system, suggesting a nuanced stance on criminal justice reform. His work in natural resource management, evidenced by the government purchase of his reservoir and the integration of his Lost River plan into Mackay Dam, further highlights a pragmatic yet forward-thinking strategy.