When it comes to building disruptive beauty brands, few people have a track record as impressive as Gail Federici. A co-founder of John Frieda in the early 2000s and the brains behind Color Wow, Federici has spent her career redefining how women approach haircare. With a reputation for spotting untapped consumer needs and turning them into cult products, she’s not just a beauty entrepreneur, she’s a brand builder, innovator and powerhouse whose net worth is estimated to be close to $600m – making her one of the richest self-made women in the US. Here, Gail opens up about what it takes to scale a beauty brand, the vision behind Color Wow and the entrepreneurial lessons she’s learned along the way.