best-selling author jason jennings has been heralded by usa today as 1 of the 3 most in-demand businesseakers in the world. he has new book, "the reinventors: how extraordinary companies pursue radical continuous change." adapt, grow, change - or perish? is it that stark? > > is that stark. if you take a look at the list of the original fortune 100 companies - you may find it surprising - only 2 are left. these are the companies who had the capital, they had the people, they had all the resources, and they couldn't survive. absolutely could not. and it's happening at increasingly warp speed. take a look at blackberry, research in motion - two years ago were at $77 billion. today their market capitalization is $5 billion. what happened? they are fast becoming irrelevant. look at circuit city. irrelevant. a few years ago, one out of every four beers sold in the united states was a budweiser beer. today it's one of 12. nobody is immune. > > so what is involved? do ceos have the responsibility of having the kind of vision to have top-down cultural change? where does this kind of change, thi