David John Smith

The Hon. David John Smith (May 20, 1907 – 1976) was the third son of Frederick Smith, 2nd Viscount Hambleden and Lady Esther Gore. He was educated at Eton College and Oxford University and served in the Second World War, gaining the rank of Major in the service of the Royal Artillery.

After his elder brother, William Smith, 3rd Viscount Hambleden, died in 1948, Smith became the Governing Director and chairman of W. H. Smith, retaining the post until 1972. The death duties on his brother's estate were so severe, however, that a public holding company had to be formed and shares were sold to W H Smith staff and the public. Under his leadership, in 1966, W H Smith originated a 9-digit code for uniquely referencing books, called Standard Book Numbering or SBN. It was adopted as international standard ISO 2108 in 1970, and was used until 1974, when it became the ISBN scheme. After 1972, the Smith family's control slipped away, and the last family member, Philip Smith, left the board in 1996.

Smith was also Lord Lieutenant of Berkshire from 1959 to 1976.

He married Lady Helen Pleydell-Bouverie (1907–2003), daughter of Jacob Pleydell-Bouverie, 6th Earl of Radnor, on July 22, 1931 and had five children:

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