Joan Milke Flores spent a formative period in Highland Park, California, following a move from Wisconsin at a young age. She completed her secondary education at Luther Burbank Junior High School and Franklin High School. Early professional experience included part-time work during high school and a role as a stenographer's pool member at City Hall. Joan Milke Flores then served as a clerk and Chief Deputy for District 15 City Councilman John S. Gibson Jr. for 13 years, managing his final election campaign and his office during his final term due to his health issues. She relocated to Gibson's district around 1979.

Joan Milke Flores's political identity is characterized by a blend of grassroots experience and strategic alliances, suggesting a highly localized approach to governance. Her career trajectory, marked by long-term service in local politics and close association with influential figures, indicates an adeptness at navigating regional power dynamics. Flores's ability to manage a councilman's office during his final term hints at a behind-the-scenes influence that balances pragmatic necessities with ideological commitments. Her personal history, including a move to the district she served and a marriage to a prominent local figure, further underscores a deeply rooted, community-focused political philosophy.