Leslie N.S. Smith is a lay member of The British Society of Master Glass Painters, and specialises in research into the artistic and craft-work provenance of stained glass.
His interest in stained glass began in 1983, when invited to write a visitors' guide to his parish church of All Saints, Orton. He considered stained glass to be part of the furnishings of the church, and therefore to be included and attributed. Searches for signed windows, and similar styles to those found in Orton, led him to local churches in ever-widening circles, until the idea of covering the whole diocese was conceived. The latter task took some seven years to complete.
He is a member of the Ecclesiological Society, one of the aims of which is the study of art in christian churches.
He has taken part in an on-going project of the Kempe Society to record details of all the windows manufactured by the firm of C.E. Kempe Studios, and C.E. Kempe & Co., Ltd., during the sixty or so years' existence of the firm.
He has a keen interest in 'recycling' of stained glass, and has, to date, been instrumental in prompting the removal of two three-light windows from redundant churches to church buildings elsewhere.
During recent years his researches have been extended into Northumberland, Durham, and the border counties of Scotland.