Community management is a critical part of growing and cultivating a healthy open source project like Jupyter. As Jupyter has grown, it has created multiple sub-projects with their own unique opportunities and challenges for growth. This year, I was hired as the first "Community Manager" for two sub-communities in Jupyter: JupyterHub and Jupyter Book. In this talk, I'll share my experience in the first several months of this role, including the things we have tried, what worked and didn't work, and what we've learned in the process. I'll share the main takeaways and provide suggestions for other communities that are interested in growing community management and where we'd like to focus next within Jupyter Hub and Jupyter Book. The audience should come away with a practical understanding of how Community Management could be used in an open source project like Jupyter, the most important learnings from our experiment, and how they could be applied to other open source projects.