She authored and co-edited the 600-page bilingual volume of books called Ein Canrif, 100 mlynedd o hanes ardal Ceulanmaesmawr ('Ein Canrif, 100 years of the history of the Ceulanmaesmawr area') in 2005. Gwynn became a Druid (Welsh : Derwydd) in the Gorsedd of the Bards in 1985, earned a Bangor University Fellowship in 2002, and was named the recipient of the Science and Technology Medal at the National Eisteddfod in June 2006. She promoted the Welsh language by becoming a member of the Central Advisory Council for Education (Wales), the Court of the National Library, Guild of Graduates Standing Committee and the University of Wales Court. Gwynn was also a president of the British Scientific Society, and of Y Gymdeithas Wyddonol Genedlaethol (the National Scientific Society).