Friday marks a rather sad and historic day in the history of political science in Britain.
The renowned Oxford psephologist, David Butler, a pioneer of the BBC's election results programmes, will be hosting the very last of his famous Nuffield Friday evening seminars.
This comes at the extraordinary age of 85, after an amazing run of 53 years. The first was held in 1957, the year Harold Macmillan became prime minister.
When I was an Oxford PPE student in the late 1970s, David Butler's Friday seminars were the academic highlight of my week.
Indeed, many weeks they were the only academic event of my week!
And Butler managed to lure a string of big names to his Nuffield College seminar room - Cabinet ministers, civil service mandarins, and leading figures in the media.
All were persuaded to give us frank and fascinating background detail and anecdotal accounts of how politics and power really work in Britain.
Many generations of Oxford students have been inspired by what they heard, and by Butler's teaching, to go into politics themselves, or the civil service, into journalism or academic life.
As a young psephologist Butler invented the concept of swing. As a TV performer in the 50s, 60s and 70s, he helped invent the once famous TV swingometer.
And over 60 years, from 1945 to 2005, he was involved the famous Nuffield election books, co-editing every edition from 1951 onwards.
What remarkable about David Butler is not just his longevity, but his continuing energy and unrelenting enthusiasm for politics and elections, not just in Britain but in several countries abroad - the US, India and Australia.
He was still conducting Oxford undergraduate tutorials until recently, and he still regularly attends seminars and hearings in all sorts of locations, though in recent years he has had to slow the pace to look after his ailing wife, the distinguished English don Marilyn Butler.
David Butler is one of the few remaining figures in British politics to have experience of the whole span of post-war political history. (Two others are Denis Healey and Butler's good friend Tony Benn).
As a don in his 20s, around the year 1950, he was twice summoned by the-then opposition leader Winston Churchill to Chartwell to explain new developments in the developing science of psephology.
"Tell me young man," Churchill reportedly asked Butler, "do you think I've become a liability to my party?"
Butler's brave response?
"Let me put it this way, sir, I'm not sure that you're the asset to your party that you once were."
Sixty years on, Butler himself certainly remains a great national asset, an inspiring figure for politics enthusiasts everywhere.
I will try to get to his final Nuffield seminar tomorrow night, though I fear that Newsnight duties may prevent me.