The term Peak Oil was created in 2000 after Jean Laherrère and Colin Campbell wrote an article in 1998 in Scientific American which title was "the End of Cheap Oil".
This paper was ignored until 2005 when oil price reached 50$/b anf fully accepted in 2008 when 140 $/b was reached. With the burst of shale oil, many papers have been published on the "Peak Oil Myth" and the fact that the USA would become energy independent thanks to the shale oil & gas revolution.
However the oil production peaked in many countries and the end of cheap oil is more than ever a reality that will strongly impact our economies. New oil projects with higher extraction costs require $100/b+ oil price to be profitable while oil demand (and GDP) contracts when oil price surpasses $120/b !