 Gannon was the subject of several RTÉ radio programmes, three RTÉ television programmes (including "The Late Late Show") and a television programme, "Gallery", made by BBC Northern Ireland.He befriended a great many people, including the artist, writer and conservationist Peter Pearson, and regular musical evenings were held at the family home in Bryan Guinness's grounds in the suburbs of Dublin.Because of his interest in antique clocks and watches, he became a member of the Irish branch of the Antiquarian Horological Society, founded by his friend William Stuart.