Mr. Paterson has made domestic violence a key issue in his career; when he was lieutenant governor, it was among his signature causes. In 2008, just a few months after taking office as governor, he signed a major expansion of New York’s domestic violence law to allow judges to issue civil protection orders against people in dating relationships, in addition to those who are married.

Last October, two weeks before the episode involving Mr. Johnson and the Bronx woman, Mr. Paterson opened a campaign to raise awareness about domestic violence, gathering with advocates for a lighting ceremony at the Empire State Building.

He has also become increasingly vocal in his criticism of former Senator Hiram Monserrate, who was convicted of misdemeanor assault last fall for dragging his companion down the hallway of his apartment building. On Friday, the governor praised the Senate’s move to expel Mr. Monserrate and spoke at length about the pressures that victims of domestic violence face from their batterers.

“This seemed like a classic case of a woman who was intimidated, who didn’t really understand what her independence could be, and was victimized,” he said of the Monserrate case, adding, “The reality is that it’s really just a prelude to another attack, in many instances.”

Part of Inner Circle

Mr. Johnson’s increasing prominence, and Mr. Paterson’s reliance on him, have worried some veteran aides to the governor, who themselves are trying to assist Mr. Paterson as he faces an enormous fiscal crisis and a daunting election effort. They would not speak by name, but more than four current or former officials expressed concern that Mr. Johnson and another aide, a former state trooper, had become the governor’s innermost circle and were simply not best equipped to help him tackle the multiple challenges facing him.

Some heads of significant government agencies have said they feel they have to go through Mr. Johnson, often known as D. J., to get to the governor. And several current and former administration officials said that Mr. Johnson’s dressing down of the governor’s Washington office in September contributed to the departure of several seasoned people from the office.

Image David W. Johnson, right, with Gov. David A. Paterson last February, has become increasingly important on the governor’s staff. Credit... Nathaniel Brooks for The New York Times

“I started getting messages from D. J. telling me to call certain players in my industry,” said one former official, who spoke on the condition of anonymity to avoid antagonizing the governor.