By Charles McGrath for the New York Times Sunday Magazine, April 12/15, 2012

Robert Caro probably knows more about power, political power especially, than anyone who has never had some. He has never run for any sort of office himself and would probably have lost if he had. He’s a shy, soft-spoken man with old–fashioned manners and an old-fashioned New York accent (he says “toime” instead of “time” and “foine” instead of fine), so self-conscious that talking about himself makes him squint a little. The idea of power, or of powerful people, seems to repel him as much as it fascinates. And yet Caro has spent virtually his whole adult life studying power and what can be done with it, first in the case of Robert Moses, the great developer and urban planner, and then in the case of Lyndon Johnson, whose biography he has been writing for close to 40 years. Caro can tell you exactly how Moses heedlessly rammed the Cross Bronx Expressway through a middle-class neighborhood, displacing thousands of families, and exactly how Johnson stole the Texas Senate election of 1948, winning by 87 spurious votes. These stories still fill him with outrage but also with something like wonder, the two emotions that sustain him in what amounts to a solitary, Dickensian occupation with long hours and few holidays.

Caro is the last of the 19th-century biographers [....]

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Slideshow: Robert Caro's Painstaking Process