The causes of the housing implosion are many: lax regulation, financial innovation gone awry, excessive debt, raw greed. The players are also varied: bankers, borrowers, developers, politicians and bureaucrats.

Mr. Cisneros, 61, had a foot in a number of those worlds. Despite his qualms, he encouraged the unprepared to buy homes — part of a broad national trend with dire economic consequences.

He reflects often on his role in the debacle, he says, which has changed homeownership from something that secured a place in the middle class to something that is ejecting people from it. “I’ve been waiting for someone to put all the blame at my doorstep,” he says lightly, but with a bit of worry, too.

The Paydays During the Boom

After a sex scandal destroyed his promising political career and he left Washington, he eventually reinvented himself as a well-regarded advocate and builder of urban, working-class homes. He has financed the construction of more than 7,000 houses.

For the three years he was a director at KB Home, Mr. Cisneros received at least $70,000 in pay and more than $100,000 worth of stock. He also received $1.14 million in directors’ fees and stock grants during the six years he was a director at Countrywide. He made more than $5 million from Countrywide stock options, money he says he plowed into his company.

He says his development work provides an annual income of “several hundred thousand” dollars. All told, his paydays are modest relative to the windfalls some executives netted in the boom. Indeed, Mr. Cisneros says his mistake was not the greed that afflicted many of his counterparts in banking and housing; it was unwavering belief.

Image Henry G. Cisneros Credit... Erich Schlegel for The New York Times

It was, he argues, impossible to know in the beginning that the federal push to increase homeownership would end so badly. Once the housing boom got going, he suggests, laws and regulations barely had a chance.