Meet the man who figures Apple is worth $240 a share by Philip Elmer-DeWitt @FortuneMagazine May 15, 2013, 5:37 PM EDT E-mail Tweet Facebook Google Plus Linkedin Share icons Trainer via LinkedIn. FORTUNE — At Credit Suisse, where he spent four years in the late 1990s, David Trainer was given what a former colleague called “a nearly impossible task — teach and convince a department of 50+ very senior analysts a better way to think about valuing their companies.” Now Trainer is trying to teach the rest of the world that “better way,” and this week he executed a neat media triple play — MarketWatch, MoneyLife and CNBC — pitching a model based on ROIC (return on invested capital) that values Apple AAPL at $240 a share. It’s hard to believe a little-known Nashville trader with an obscure theory and a bizarre Apple valuation could move a market. But shortly after his media blitz began Tuesday, Apple’s share price dropped more than $9. After his CNBC appearance Wednesday it fell another $21 to dip below $423 — thus wiping out two and a half weeks of gains. I watched Trainer’s CNBC appearance (best line: “Steve Jobs was the Bo Jackson of CEOs”). I read his blog post. I looked up ROIC in Investopedia. I studied his Apple model. I couldn’t make any sense of it. Maybe you can.