Mark Cusack (he/they) is the founder of @notdefining, a platform which provides educational content and support for those who experience fluid, undefined or complex sexuality and gender. Mark is a lecturer, public speaker and integrative coach, specializing in complex sexuality and gender. He was formerly LGBTQ+ representative for the UK Civil Service and writes regular columns on LGBTQ+ issues
Fluidity can mean and define a person in a variety of ways, Mark Cusack's fluid is an essential guide for those who seek to understand it. -- Ritch C. Savin-Williams, Professor Emeritus of Psychology Cornell University