Alexandra Marron is a Staff Developer, Researcher, and Writer-In-Residence at the Teachers College Reading and Writing Project. Her responsibilities include leading a yearlong study group for master teachers, presenting at conferences, teaching sections at the TCRWP summer institutes, and above all helping teachers and principals in a dozen schools lead state-of-the-art reading and writing classrooms. Ali has played a leadership role in developing learning progressions in argument writing, and co-leads a study group on the subject, sponsored by the Council of Chief School Officers, involving ETS and TCRWP. Ali graduated from Columbia University. Prior to joining the TCRWP, she taught at PS 6, one of the Project’s mentor schools, and while there contributed to the book Practical Punctuation: Lessons on Rule Making and Rule Breaking in Elementary Writing (Heinemann 2008).