Gwyned Trefethen is a self-taught artist who started her quilting career first as a hobby after retiring from her previous job in 1988. The daughter of American mechanical engineer Lloyd M. Trefethen and World War II code breaker Florence Newman Trefethen, her passion for and style of quilting later evolved after completing a traditional quilt class and specializing in fiber art. She carefully selects commercial fabrics and thread, which consist of multicolored hues, to craft artworks that highlight the technical aspects of sewing and incorporate sharp edges and contrasts between light and shadow. The artist moved towards fiber art of her own design and modified quilted patterns rather than making them as is.
Trefethen has been affiliated with the Studio Art Quilt Associates for fifteen years, where she currently serves on the Board of Directors as Treasurer. From 2005-2008, the artist was the Massachusetts and Rhode Island representative for SAQA, which advocates for the quilt as another art medium that adheres to the same design principles. Other memberships include the Fiber Arts Coalition, Wisconsin Visual Artists, and the Rhododendron Needlers Quilt Guild. Today, she hosts workshops from her Massachusetts studio and teaches people of all backgrounds essential design techniques of fiber art and quilting through private lessons and lectures.