Margaret Arney holds a bachelor's degree in government studies from Harvard University and a master's in social service administration from the University of Chicago. Arney spent several years in nonprofit work, including a role at Chicago Commons, before returning to Milwaukee to engage in fundraising and market research for local organizations. Arney has held teaching and administrative positions at Cardinal Stritch University and Concordia University Wisconsin, while also serving as a consultant for the African American Leadership Alliance of Milwaukee. Arney's leadership roles include founding Tosa Together and serving as president of the Wauwatosa Neighborhood Association Council. Arney's professional background encompasses program direction, teaching, and community leadership.

Margaret Arney’s political identity is marked by a staunch commitment to social justice and labor rights, combined with a surprisingly progressive stance on healthcare. Arney's advocacy for 100% pro-choice policies in healthcare juxtaposes with her robust support for union rights, revealing a nuanced approach that balances individual freedoms with collective worker empowerment. Her rhetorical style often emphasizes the interconnectedness of social issues, suggesting a deeply rooted belief in systemic change. Arney's legislative record shows an unexpected convergence with opposing factions on environmental regulations, revealing a highly calculated approach to protecting regional industrial interests.