Harry Diamond was Head of Public Relations of the City of Glasgow for 16 years until he retired in 1991. He has been a member of the governing Executive Committee of Erskine Hospital, Britain’s largest hospital for ex-Service men and women, since 1974 and has just published a history of the hospital under the title Do You Sleep With That Leg On?

His autobiography CAN YOU GET MY NAME IN THE PAPERS? was published in 1996.

Diamond served in the army towards the end of the Second World War.

In 1997 he negotiated with Israel Antiquities Authority for the loan of the Dead Sea Scrolls exhibition which ran at Glasgow’s flagship Museum and Art Gallery at Kelvingrove the following year. It was the UK’s only venue.

In 1994 he was described by PRWEEK as one of the most influential Public Relations practitioners of the previous decade.

In 1985 he was said by Local Government News to be "probably better known round the world than any other Public Relations man in Scotland because a great deal of what he writes about Glasgow is published and broadcast in Europe, America, Canada, and Australia."

His working life as a journalist started in 1944 with the (Glasgow) Herald. He also worked for the Scottish Daily Express, Scottish Daily Mail, The Bulletin, and contributed to BBC radio and television, Scottish Television and Radio Clyde

Diamond is a widower with two sons, both lawyers, one grandson and three grand-daughters.