Dann, who bought Seal in 2002 and sold it three years later, has managed to clock up 25 years at the agency.
But why has he been at one agency for so long?
'For my interview at Seal I sat in a big room with the MD at the time, Alf Hill, who asked what I liked outside of work,' revealed Dann.
'As I was nervous I seem to recall mentioning I enjoyed a drink down the pub with my mates,' he continued. 'Without hesitation he pulled a gin bottle from the drawer in his desk and poured me a large one, before sliding it down the table. I never wanted to leave after that.'