Marni Sommer is an associate professor of sociomedical sciences at the Mailman School of Public Health, Columbia University. She leads the gender, adolescent transitions, and environment program. She developed, along with the International Rescue Committee, the “MHM in Emergencies Toolkit” collaborating with UNICEF and global partners on MHM in Ten, a 10-year agenda aimed at transforming schools for menstruating girls and female teachers.