Brian Clough
At Derby County he took over in May 1967 when the club finished 17th in the 2nd Division.
Two years later the club won the division and gained promotion to the top flight.
Derby followed that up by finishing 4th and 9th before becoming English champions in 1972.
A year later they reached the European Cup semifinals where they controversially lost to the "cheating bastards" of Juventus (Clough's own words).
So in the space of five seasons they went from a 2nd Division club to English champions to European Cup semifinalists.
At Forest Clough took over in January 1975 when the club were struggling to avoid dropping into the 3rd Division. They eventually finished 16th in Division 2.
Two years later in 1977 Clough guided Forest to the top flight when they finished 3rd in the 2nd Division.
The following season they became league champions.
A year after that they won the European Cup and successfully defended the trophy the next year.
Once again he had taken a 2nd Division side and made them English champions.
From 1976 to 1980 he turned a 2nd Division team into two-time European champions.
And in each circumstance he had limited funds and no prominant youth academy to help build his teams.
Classic Clough...
"They say Rome wasn't built in a day, but I never had that particular job."
"I may not be the best manager in the business. But I'm certainly in the top one."
Indeed.