Colette Langan received an extensive training in stained glass conservation with Chapel Studio in the UK and was there from the beginning of the establishment of the conservation department, led by Alfred Fisher. She later worked with Steven Clare in the development of isothermal glazing in the 1990’s. While there she worked on medieval glass from Westminster Abbey, Winchester Cathedral, Lincoln Cathedral and many other landmark buildings in the UK. She also conserved windows by William Morris, Pugin, Kempe, Tiffany and Harry Clarke in her own studio in Ireland.