This passage really strikes me, because he is happy, though his life seems so tragic, so emblematic of the dark side of technological obsession. It's a bittersweet mixture of a "there but for the grace of God, go I" feeling and a simultaneous admiration for the purity of his life's focus. It makes me reflect on my own life:

"Mr. Draper's unusual behavior, such as shouting at anyone smoking anywhere near him, could wear on fellow workers and employers. 'He was not a self-starter, or associated with all the companies springing up back then,' says Mr. Wozniak. 'But, actually, John is one of the happiest guys I know, no matter what his situation seems.'"