Alan Gibson was born in Yorkshire, but the family moved to the East End of London when he was a small child, and subsequently to the West Country, where he attended Taunton School. Apart from his time at university, he spent all his subsequent life in that region, most of his cricket reporting being of Somerset and Gloucestershire matches. After school he went to Queen's College, Oxford, where he gained a First in history and was elected President of the Oxford Union, though he never took office because of being called for National Service.
Gibson was a member of the Liberal Party and served as President of the Falmouth and Camborne Liberal Association. He stood as parliamentary candidate for that constituency at the 1959 General election but came third.
He was briefly a travelling lecturer with University College, Exeter, before getting a job with the West Region of the BBC Radio Home Service. That led him into cricket (and other sporting) commentary on matches in the region, though he did not do much of this until leaving the BBC staff and becoming a freelance. Eventually he graduated to national broadcasts, including appearances on Test Match Special from 1962 to 1975. He was a presenter of the BBC West regional TV news magazine programme Westward Ho! during 1953. He was the narrator for the short documentary film Falmouth for Orders in 1965 and for three episodes of the BBC TV natural history series The World About Us between 1968 and 1973. Subsequently he did some TV cricket commentary on county matches for HTV.
He wrote on cricket at various times for The Sunday Telegraph, The Guardian, The Spectator and The Cricketer. From 1967 until 1986 he was a cricket reporter for The Times. He also reported rugby union, in print and on radio. He spent some time as an early-morning disc-jockey, as well as appearing on the radio shows Sunday Half Hour and Round Britain Quiz.
As a cricket commentator he was articulate and often drily humorous. On a Saturday afternoon sport programme, Neil Durden-Smith once mentioned that he had been having tea with the Bishop of Leicester. On being cued in, Gibson began his commentary stint with: "No episcopal visitations here." His cricket writing for The Times was generally light-hearted, often concentrating more on his journey to the match (invariably by train, often changing at Didcot, rarely straightforward) than on the cricket itself. On at least one occasion his day's report was published even though rain had prevented any cricket from taking place.
In his pieces he coined the descriptions "the Sage of Longparish" for his colleague John Woodcock, "the Demon of Frome" for Colin Dredge of Somerset, the Old Bald Blighter (the OBB) for Brian Close and "the Shoreditch Sparrow" for Robin Jackman. Woodcock said concerning their reports for The Times: "I write about the cricket, and Alan writes about 'A Day at the Cricket'." His cricket books, though still containing plenty of humour, were more serious affairs, knowledgeable and well researched.
In 1975 he was chosen to give the address at the memorial service for Sir Neville Cardus, held at St Paul's, Covent Garden. This was printed in the following year's edition of Wisden Cricketer's Almanack. He was elected the first President of the Cricket Writers' Club in 1982.
Not a robust man, he had spells of depression, once spending some time in a psychiatric hospital. He also had a drink problem (which was the reason he was dropped from Test Match Special). His reports for The Times often referred to his regular appearances at 'The Star' public house in High Littleton, where he lived, and reports of matches involving Gloucestershire invariably mentioned the GRIP – the Gloriously Red-headed Imperturbable Pamela, the barmaid in the main pavilion bar at the County Ground at Bristol.
He married twice: to Olwen Thomas in 1948 and to Rosemary King in 1968. Both marriages produced two children and both ended in divorce.