Who are the prominent figures Katy Huie Harrison has collaborated with in redefining motherhood?

Based on the available content, Katy Huie Harrison, the host of the Undefining Motherhood podcast, collaborates closely with co-host Sarah Creel. Sarah is described as an aunt and hopeful future mama. Together, they use their combined experience and research to challenge societal expectations and norms around motherhood. However, specific names of other prominent figures they've collaborated with aren't mentioned in the content I have.

Would you like to know more about the topics they discuss on the podcast, or are you interested in Katy's personal journey and experiences?