Well, in addition to salary, he would have also gotten a bonus and stock. The bonus might be $50K/year, and then maybe another $100K/year in stock. The number of shares in the stock grant would have been computed at the date he started -- 5 years ago, GOOG was around $440/share, so at today's price, the shares would be worth $245K/year, assuming he held onto them as they vested.
So, that adds up to around $495K/year, or maybe $300K after tax. With $50K/year in expenses, you're left with $250K/year, or $1M over 4 years.