Frederica Patmore, coauthor of The Knitting Book (with Vikki Haffenden), is a design consultant for Rowan Yarns, one of the biggest providers of luxury yarns in the world. She runs a number of classes at different skill levels in branches of the John Lewis department store and independent knitting shops, and contributes to needlecraft publications. As well as being a master of knitting technique, Frederica is an accomplished and successful knitting pattern designer. Vikki Haffenden, coauthor of The Knitting Book (with Frederica Patmore), is a professional knitted textiles designer with a background in commercial knitwear design. She teaches at the University of Brighton, and her work has been featured in Woolcraft, The Cool Girl's Guide to Knitting, and The Cool Girl's Guide to Crochet. Vikki acted as a design consultant to develop Rooster hand-knit yarns and Rooster Pattern Book One. She is the author of Double Bed Machine Knitting: Explained, and her research into knitting was profiled in Selvedge magazine.