twa, rjr nabisco, marlo comics, blockbuster, u.s. steel. another all and dozens more have felt the pointed sting of the foremost activist investor of the past 25 years. >> back in the beginnings, he was greenmailer, somebody who would come in and say, you either do this or i will basically flip your stock, i will take your company apart. >> sometimes he did, as in the case of twa. other times he'd shake up the c suite or board and demand a stock buyback or dividend boost or spin-off. he lost some battles but the scrappy kid from scenes won far more than he lost. not for nothing. he won often enough to become, according according according to "forbes," the richest person on wall street today. his net worth, roughly $25 billion. >> he likes to agitate. he wants to get into a company and get on the board and make the company do what he wants by almost any means necessary. he's not afraid if he makes a lot of noise or ruffles some feathers, that's just carl being carl. >> boy, has carl been carl over the past year. the 78-year-old has fought wi