This article presents a case study of two schools that were identified as a result of UNESCO associated schools survey as cases of sustainable leadership and governance. The aim of the study is to present the two cases that were crystalized in the survey carried out at end of the United Nations' "Decade of Education for Sustainable Development" (2005-2014). Prior to the in-depth study of two schools, the authors have carried out a survey of the heads and deputy heads of 26 UNSECO associated schools in Latvia on how schools are succeeding in improving educational outcomes, school development, cooperation with multiple stakeholders, and innovation. The authors have carried out semi structured interviews with the heads and deputy heads of two schools on the following questions: "How has ESD updated and improved educational purposes and outcomes in your school?" "Does ESD improve test scores and/or achieve other desired outcomes?" "How does ESD help to improve and enrich school curriculum development in your school?" "How does ESD guide students to have the knowledge, skills and values to care for and solve the sustainable development issues that arise in your school?" "How does ESD help to strengthen the partnerships between schools and other stakeholders, including the surrounding community?" "How does ESD promote innovation in the teaching-learning conceptual framework?"