Dr. Sreyashi Jhumki Basu was a scholar committed to equity and social justice in science education who passed away in December 2008. In this essay, I describe Jhumki's research and the call to action her life's work has laid out for the science education community. In particular, I draw attention to the role of critical science agency in learning and the democratic science pedagogy model that Jhumki developed to support students in crafting such agency.