The Curly Girl Method was developed in the early 2000s by Lorraine Massey for a North American and European market. The products it recommends, the protein-moisture balance it prescribes, and the ...
The Andre Walker hair typing system, the 1-to-4, A-to-C grid that dominates every curl forum and shampoo label, was developed in the early 1990s in the United States, primarily to categorise the hair ...