In urban planning, a brownfield is a former industrial or commercial site where environmental contamination hinders development. They exist in almost every community—there is probably one in your neighborhood—and state or federal resources can be used to facilitate assessment, cleanup and reuse. Drawing on a range of local and international experiences, this collection of essays focuses on cases where citizens, nonprofits, developers, cities, and state and federal agencies overcame challenges and mitigated risks to redevelop brownfields using leading-edge practices and simple innovations. The Covid-19 pandemic and mass civil unrest of 2020 underscores the importance of health and social justice considerations in future development initiatives.