There seem to be a lot of Hodgson-era* fans coming out of the woodwork lately, which got me curious as to when everyone else jumped on board. Managers can define eras, both successful and unsuccessful, in a club's history and can act as shorthand for expressing what the club was like at any given moment in time. Tell someone you started following during the Bob Paisley era and anyone who knows a bit of history will know that you joined up at the right time. Mention other managers' names and you get looks of pity instead.
And so, a very scientific study coming through! I'm starting with Shankly on the odd chance that there's someone who is old enough to remember his tenure, but earlier than that and you're on your own. The readership of this site does skew American, so it will be interesting to see if any of this correlates with the increased availability of the Premier League on TV in North America (or anywhere else outside of England) in the last ten years.