Quin practiced law with the Louisville firm Helm & Bruce until 1908, when he became a city attorney.
[1][3] He also helped develop a police call box system, pushed the fire department to become motorized, and organized the Public Utilities Bureau of the city.
[1][3] He helped the transition of the University of Louisville from various buildings around town to the Belknap Campus.
After his term as mayor, he served as president of Title Insurance & Trust Company until his death.
[1] Quin died on August 14, 1938, at the Norton Memorial Infirmary in Louisville.