A native of the Conwy Valley, Sel Williams has been at various times a labourer, a research scientist, a school teacher and a lecturer at the Normal College and at the University of Bangor . He has a background in teaching and research in Biology and Economics. Although retired, he continues to work part-time as a tutor in the Community Development Unit at the School of Lifelong Learning, Bangor University. He has practical experience in community development and is currently active with a number of community initiatives, mainly in his home in the Vale of Ffestiniog.
Sel Williams, Cloriannu Cymdeithasiaeth: Syniadaeth wleidyddol Cymdeithas yr Iaith Gymraeg,Gwerddon, 17, March 2014, 41-57.