The Maternal Health Task Force (MHTF) is a three-year effort funded by the Bill and Melinda Gates Foundation. The group held a retreat to 'take stock of the field' of maternal health for three days in Tarrytown, NY. Unlike other end of project meetings, the meeting, called #MHBUZZ, asked five overarching questions about the field of maternal health and brought together 60 thinkers and activitists to tackle the questions. I was privileged to attend and hope that the incredible intensity of the discussion sparks ongoing discussion. One question brought forward and discussed by Wendy Graham is 'Do we really know what works?'.