Simmons talked about peak oil decades after Hubbert.
https://www.forbes.com/sites/rrapier/2016/09/08/what-hubbert-got-really-wrong-about-oil/#b7155b52a3bc
...In a 1956 paper, Nuclear Energy and the Fossil Fuels, Hubbert suggested that oil production in a particular region would approximate a bell curve, increasing exponentially during the early stages of production before eventually slowing, reaching a peak when approximately half of a field had been extracted, and then going into terminal production decline.
A peak in oil production, that is the maximum rate of production after which a field, country, or the world as a whole begins to decline is at the core of the peak oil issue. A country is said to have peaked, or reached peak oil after it becomes apparent that oil production in the region is steadily declining year after year. Hubbert is widely credited with accurately predicting the peak of U.S. oil production. In fact, his prediction has taken on a mythological status...
Yes, but I was responding to a post about the peak oil rhetoric in the 2000s.
I attended a conference in which Simmons spoke about Peak Oil. He twist was fixation on Ghawar field, the king of oil fields in Saudi Arabia. He was describing that the way that field went, so went peak oil as SA was using Ghawar as the swing oil supplier. When it could no longer do that and was required to go full throttle to supply SA needs, Simmons said peak oil would have arrived.
He made millions being an advisor with that theory which he trumpeted to the end.
It remains a mystery how he died in his hot tub at a fairly young age. Perhaps his venture into the green energy schemes may not have been appreciated by some.