[1] As an insurance broker he was founder of the Glasgow firm of William Euing & Co.
He was a friend of James Orchard Halliwell who engendered in him a love of old books .In 1815 he co-founded Inglis, Euing & Co, and in 1819 created the independent company of William Euing & Co in which he was sole partner.
[2] In 1865 he was elected a Fellow of the Royal Society of Edinburgh, having been proposed by his cousin, James Smith of Jordanhill.
Some 1800 duplicates were sold to Glasgow Corporation, helping to build the foundation of the Mitchell Library.
[5] The Euing Collection contains examples of rare books, first editions and manuscripts including:[6]